Adjust the auxiliary handle and height ID: lst300-handle-adjust 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: Is the original auxiliary handle already fully attached with intact adjustment parts? Yes -> check-2: Use the adjustment button, not the initial-assembly buttons. No -> prepared: Use Fit the supplied auxiliary handle for initial assembly; damaged parts need service. Not sure -> prepared: Keep the battery removed. Save your preparation record and check the matching manual before continuing. check-2: Do the handle button and height collar release normally without damage or force? Yes -> steps: Adjust while the battery stays removed. No -> service: A binding or broken lock needs service before the tool is used. 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. Set a stable starting position Support the tool with its cutter clear of you and the battery out. Identify the handle adjustment button shown as 13 in fig H and the height collar shown as 4 in fig I. Look for: You can distinguish the handle adjustment button from the two initial-assembly buttons. Source: lst300-manual, English p8 Attaching the auxiliary handle; figs F–H [ ] 3. Choose the handle angle Press the handle adjustment button and raise or lower the fitted auxiliary handle. Use the manual working stance as the reference: the front arm should be straight. Release the button so the handle holds. Look for: The handle stays at the selected angle once the button is released. Source: lst300-manual, English p8 Attaching the auxiliary handle; figs F–H [ ] 4. Set the shaft length Loosen the height collar in the arrow direction shown in fig I. Move the upper housing straight up or down, then turn the collar the opposite way until tight. Keep the normal trimming orientation for this task. Look for: The upper housing slides without twisting the tool into edging mode. Source: lst300-manual, English pp8–9 Height adjustment / Operating the trimmer; figs I, J1 [ ] 5. Check the working clearance without power Hold the battery-removed tool in the stance pictured in fig J1. Set enough height to keep at least 24 inches (609.6 mm) between the guard and your feet; readjust the collar if necessary. Look for: The stance is balanced and the documented guard-to-foot clearance is available. Source: lst300-manual, English pp8–9 Height adjustment / Operating the trimmer; figs I, J1 [ ] 6. Verify both locks and record the fit With the controls released, confirm that the handle stays in its angle and the shaft does not slip. Record the adjustment made; a slipping collar or handle is a stop condition. Continue to after-care before use. Look for: Both adjustments retain their position without the release being held. Source: lst300-manual, English pp8–9 Height adjustment / Operating the trimmer; figs I, J1 OBSERVATIONS Tool type exactly as printed on the label (required): ____________________ Exact-type manual reference or link that you matched (required): ____________________ Handle and height changes made (required): ____________________ Handle and height collar both hold their positions (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 auxiliary handle locks with the front arm in the manual’s working position. [ ] The tightened collar holds the selected length and allows the documented foot clearance. NEXT CARE A different user or an unsuitable working stance requires adjustment Inspect when the stated condition occurs. The manual gives no fixed day or month interval. Basis: manufacturer Source: lst300-manual, English pp8–9 Height adjustment / Operating the trimmer; figs I, J1 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 pp8–9 Height adjustment / Operating the trimmer; figs I, J1 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.