Set the tool for edging or trimming ID: lst300-edging-convert 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: Good lighting [ ] Material: No replacement material needed for an intact tool 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 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: Do the collar and wire edge guide match figs I and K–L and appear undamaged? Yes -> check-2: Confirm the current mode before releasing the collar. No -> prepared: A different guide or adjustment mechanism needs its own type manual. Not sure -> prepared: Keep the battery removed. Save your preparation record and check the matching manual before continuing. check-2: Can the collar be released and retightened normally, with the shaft and housing supported? Yes -> steps: Make the mode change with no battery installed. No -> service: A slipping collar or binding adjustment needs service. 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 the current mode Keep the battery removed and compare the current head orientation with the normal trimming view and edging view in figs J and K. Record which mode you need next. Look for: The desired change is clear before you loosen anything. Source: lst300-manual, English p9 Convert to edging mode; figs I, K–L [ ] 3. Release the mode collar Support the tool and turn the collar in the release direction shown in fig I. Hold the metal shaft so the adjustment is controlled; keep the guard cutter away from you. Look for: The collar releases without force and the metal shaft remains supported. Source: lst300-manual, English p9 Convert to edging mode; figs I, K–L [ ] 4. Rotate the lower housing For edging, hold the metal shaft and rotate the lower housing 180 degrees into the position in fig K. To return from edging to trimming, rotate it back 180 degrees to the trimming position. Look for: The head orientation matches the selected figure; this is one half-turn, not a shaft-height adjustment. Source: lst300-manual, English p9 Convert to edging mode; figs I, K–L [ ] 5. Tighten and position the wire guide Turn the collar back until tight. For edging, position the tool with the wire guide along the working surface as fig L shows. For trimming, retract the guide to its original out-of-the-way position. Look for: The collar is tight and the wire guide matches the selected mode. Source: lst300-manual, English p9 Convert to edging mode; figs I, K–L [ ] 6. Check the selected setup without power Confirm the collar holds the head orientation and the guard remains secure. Record the chosen mode. Before any use, finish after-care; edging requires at least 100 feet (30 m) between the work and other people or pets. Look for: The mode is mechanically set; no powered cutting is part of this adjustment task. Source: lst300-manual, English p9 Convert to edging mode; figs I, K–L OBSERVATIONS Tool type exactly as printed on the label (required): ____________________ Exact-type manual reference or link that you matched (required): ____________________ Mode selected (required): ____________________ Choices: Edging / Trimming Collar holds and guide matches the selected mode (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 [ ] The lower housing matches the selected trimming or edging figure and the collar is tight. [ ] The wire guide is set for that mode; the battery remains removed until after-care is complete. NEXT CARE Changing between normal trimming and maintenance edging Inspect when the stated condition occurs. The manual gives no fixed day or month interval. Basis: manufacturer Source: lst300-manual, English p9 Convert to edging mode; figs I, K–L 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 p9 Convert to edging mode; figs I, K–L 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.