Store spare cutting line correctly ID: lst300-spare-line-storage Version: 2.0.0 Model: BLACK+DECKER LST300 · US · AF-100 Region: US Parts: Automatic-feed head with AF-100 spool; match model and tool type to manual Not covered: LST420 / LSTE525; GH corded models; Dual-line heads; Metal line or blades; Nonmatching tool type or modified head; Unknown tool type or missing exact-type manual; Bump-feed conversion MATCH YOUR VERSION Model and tool type: LST300 and the exact type on my label match my manufacturer manual and figures Remove the battery before finding the label. Use the manufacturer model-and-type lookup; this site does not infer a type number from LST300 alone. Cutting head: Original AF-100 automatic-feed single-line head Do not substitute a bump-feed procedure, dual-line spool or metal cutting attachment. PREPARE [ ] Release the trigger, let the head stop, engage the lock-off and remove the battery. Leave it removed throughout hands-on care. Keep fingers away from the sharp cutter on the guard. [ ] Read LST300 and the tool type from the label. Open the official model/type lookup and compare its manual and parts figures with your actual guard, single-line head and AF-100 spool. A readable model name alone does not establish the type. If the exact type manual cannot be obtained, or any figure differs, save a preparation record and stop. [ ] Tool: Tablespoon measure [ ] Material: Sealable plastic bag [ ] Material: One tablespoon of water [ ] Material: Spare compatible prewound spool or bulk line STOP Keep the battery removed if the exact type/manual match is unknown or parts differ from the figures. Stop for a damaged battery, exposed wiring, a faulty switch, cracked guard, broken spool/hub, damaged cap tabs or housing slots. Use an authorized service center. Never open the battery, motor housing or charger. CONSUMABLE FIT Bulk cutting line: 0.065 inch (1.65 mm) round nylon monofilament Fit: Intact original AF-100 spool with the slot, adjacent anchor hole, arrow and fill recesses in figs P–R Do not substitute: Serrated, square, heavier or metal line; different anchor geometry Source: lst300-manual, English p10 Rewinding spool from bulk line; figs P–R Factory-wound replacement spool: BLACK+DECKER AF-100; 0.065 inch (1.65 mm) round nylon monofilament Fit: Original LST300 automatic single-line head, after exact tool-type/manual match Do not substitute: Bump-feed or dual-line heads; metal, serrated or heavier line; unverified replacement heads Source: lst300-manual, English p9 Cutting line / Line feeding; Replacement accessories Spare-line storage bag: Sealable plastic bag with one tablespoon of water Fit: Spare prewound spools or bulk line only Do not substitute: Assembled trimmer, battery, charger or any electrical component Source: lst300-manual, English p10 Maintenance item 2 CHECK ROUTE safety: Is the battery removed, the trigger released and the cutting head stopped, with no battery damage, exposed wiring or faulty switch? Yes -> compatibility: Keep the battery removed for every hands-on step. No -> service: Stop using the tool for electrical, battery or switch damage. If you have only omitted battery removal, make the tool safe before restarting. Not sure -> prepared: Keep the battery removed. Save your preparation record and check the matching manual before continuing. compatibility: Have you matched the label LST300 AND its exact tool type to the official lookup manual and its figures, with the original AF-100 automatic single-line head? Yes -> check-1: Record the label type and matching manual reference in the first step. No -> prepared: An unknown type, unavailable type manual, different figures, bump-feed head or dual-line conversion blocks this procedure. Use manufacturer support to identify the correct instructions. Not sure -> prepared: Keep the battery removed. Save your preparation record and check the matching manual before continuing. check-1: Are you storing loose spare line or an unfitted spare spool, separate from the tool, battery and charger? Yes -> check-2: Only spare nylon supplies belong in this method. No -> prepared: Remove spare supplies from electrical equipment; do not apply this water treatment to the assembled tool. Not sure -> prepared: Keep the battery removed. Save your preparation record and check the matching manual before continuing. check-2: Is the spare line verified as compatible round nylon and is the bag clean and sealable? Yes -> steps: Use the manual’s one-tablespoon bag method. No -> prepared: Check line specifications and prepare a suitable bag first. Not sure -> prepared: Keep the battery removed. Save your preparation record and check the matching manual before continuing. CARE STEPS (only when the route reaches steps) [ ] 1. Record the exact tool and make it safe Release the trigger, let the head stop, engage the lock-off and remove the battery. Leave it removed throughout hands-on care. Keep fingers away from the sharp cutter on the guard. Read LST300 and the tool type from the label. Open the official model/type lookup and compare its manual and parts figures with your actual guard, single-line head and AF-100 spool. A readable model name alone does not establish the type. If the exact type manual cannot be obtained, or any figure differs, save a preparation record and stop. Look for: The battery is physically separate from the tool; your label type and matching manual reference are written below. Source: bd-manual-help, Official model/type lookup instructions; type is beside or below the model number [ ] 2. Identify and separate the spare supply Read the AF-100 or bulk-line marking. Put the compatible spare spool or bulk line on a clean surface away from the trimmer, removed battery and charger. Keep the product label for later identification. Look for: Only spare nylon supplies are being prepared; no electrical equipment will enter the bag. Source: lst300-manual, English p10 Maintenance item 2 [ ] 3. Prepare a sealable bag Use a clean plastic bag that can be sealed around the spare supplies. Keep the line identity readable on a label outside the bag so it cannot be confused with heavier or differently shaped line. Look for: The storage bag closes and the line specification can still be identified. Source: lst300-manual, English p10 Maintenance item 2 [ ] 4. Add the manual’s water amount Place the spare prewound spool or bulk line in the bag and add one tablespoon of water, as the maintenance section specifies to prevent line drying. Keep all water away from the tool, battery and charger. Look for: The measured tablespoon is in the spare-line bag; this is not an instruction to wet the head or motor. Source: lst300-manual, English p10 Maintenance item 2 [ ] 5. Seal and store the supplies Seal the bag and keep it separate from electrical equipment in the storage area. The manual gives no soaking duration or recurring water-addition schedule; do not invent either. Look for: The bag remains sealed and separate from the battery and charger. Source: lst300-manual, English p10 Maintenance item 2 [ ] 6. Record the stored part Record the line marking, bag location and preparation date. When the line is needed, check its specification again and follow the spool-fitting or winding task. Keep bag water out of the tool during handling. Look for: The saved record makes the correct spare supply easy to identify later. Source: lst300-manual, English p10 Maintenance item 2 OBSERVATIONS Tool type exactly as printed on the label (required): ____________________ Exact-type manual reference or link that you matched (required): ____________________ Spare-line marking and storage location (required): ____________________ Date prepared (required): ____________________ Result of this task (required): ____________________ Choices: Checks passed; ready for the stated next step / More preparation or a linked task is needed [further care/preparation needed] / Leave unused and contact service [service required] RESULT CHECKS [ ] Only compatible spare prewound or bulk line is stored in the sealable bag with one tablespoon of water. [ ] The bag is labeled and kept separate from tool, battery and charger. NEXT CARE Spare nylon line is being stored Use the bag method for spare supplies. No soaking time or replenishment interval is specified. Basis: manufacturer Source: lst300-manual, English p10 Maintenance item 2 Record preparation, maintenance readiness, problem located or service needed. This is not proof of a physical repair. SOURCES BLACK+DECKER LST300 instruction manual (manufacturer document, retailer-hosted) https://pdf.lowes.com/productdocuments/1935f26b-7448-4c95-b467-a223bb73d80f/63056925.pdf English p10 Maintenance item 2 Checked: 2026-10-13 Manufacturer copyright, hosted by Lowe’s. Facts paraphrased; no diagrams or manual redistributed. BLACK+DECKER: locate a manual using model and type number https://support.blackanddecker.com/hc/en-us/articles/360012700118-How-can-I-get-a-parts-list-or-manual-for-my-tool Official model/type lookup instructions; type is beside or below the model number Checked: 2026-10-13 Linked only. BLACK+DECKER LST300 product and support https://www.blackanddecker.com/products/lst300 LST300 model identity; Automatic Feed Spool; Includes AF-100 Checked: 2026-10-13 Linked only; no product photos reused.