LST300 line & automatic-feed round ID: lst300-line-round Version: 2.0.0 Check the documented line specification, seat the original spool and diagnose remaining feed trouble. OUTCOME A consumable-fit and spool/feed record for the exact tool type. Round result: Not recorded MODEL BLACK+DECKER LST300 · US · AF-100 US 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 PREPARE [ ] Correct AF-100 spool or exactly specified line [ ] The matching model/type manual [ ] Good light TASK ORDER 1. Check the replacement line specification Match round nylon line and the original AF-100 single-line head. Task lst300-line-spec / 2.0.0 https://csl-14-small-repair.pages.dev/tasks/lst300-line-spec/ Recorded result: Not recorded 2. Replace the cutting-line spool Fit the spool in the order shown by the matching tool-type manual. Task lst300-spool-replace / 2.0.0 https://csl-14-small-repair.pages.dev/tasks/lst300-spool-replace/ Recorded result: Not recorded 3. Check automatic line feed failure If feed is still wrong, use the automatic-feed route; do not bump the head. Task lst300-feed-failure / 2.0.0 https://csl-14-small-repair.pages.dev/tasks/lst300-feed-failure/ Recorded result: Not recorded TASK OBSERVATIONS Check the replacement line specification Result: Not recorded Service needed: Not recorded Steps recorded: 0 / 6 Revision: 0 Route: Tool type exactly as printed on the label: Not recorded Exact-type manual reference or link that you matched: Not recorded Diameter, shape, material and spool marking checked: Not recorded Chosen fitting route: Not recorded Result of this task: Not recorded Replace the cutting-line spool Result: Not recorded Service needed: Not recorded Steps recorded: 0 / 7 Revision: 0 Route: Tool type exactly as printed on the label: Not recorded Exact-type manual reference or link that you matched: Not recorded Spool marking checked: Not recorded Cap after refitting: Not recorded Result of this task: Not recorded Check automatic line feed failure Result: Not recorded Service needed: Not recorded Steps recorded: 0 / 7 Revision: 0 Route: Tool type exactly as printed on the label: Not recorded Exact-type manual reference or link that you matched: Not recorded Condition found: Not recorded Action completed or linked task still needed: Not recorded Result of this task: Not recorded SEASON & REMINDER Before the cutting season: check supplies. Repeat when line or feed behavior requires it. Consumption depends on actual cutting. This reminder is not a replacement interval. Reminder: Choose your own date User-selected reminder; task-specific manufacturer triggers remain authoritative CONSUMABLE FIT 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 Exclude: Bump-feed or dual-line heads; metal, serrated or heavier line; unverified replacement heads 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 Exclude: Serrated, square, heavier or metal line; different anchor geometry Replacement spool cap: BLACK+DECKER RC-100, confirmed against the exact tool-type parts list Fit: Original compatible AF-100 housing with undamaged slots Exclude: Damaged housing; caps with different tabs; forcing an apparently similar part 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 Exclude: Bump-feed or dual-line heads; metal, serrated or heavier line; unverified replacement heads Replacement spool cap: BLACK+DECKER RC-100, confirmed against the exact tool-type parts list Fit: Original compatible AF-100 housing with undamaged slots Exclude: Damaged housing; caps with different tabs; forcing an apparently similar part 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 Exclude: Bump-feed or dual-line heads; metal, serrated or heavier line; unverified replacement heads 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 Exclude: Serrated, square, heavier or metal line; different anchor geometry Task records describe observations, not a physical repair certification. SOURCES BLACK+DECKER LST300 instruction manual (manufacturer document, retailer-hosted) https://pdf.lowes.com/productdocuments/1935f26b-7448-4c95-b467-a223bb73d80f/63056925.pdf English p9 Cutting line / Line feeding; Replacement accessories; English pp9–10 Replacing the spool; figs M–O; English pp10–11 Automatic line feed does not work; figs N, Q, R 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 BLACK+DECKER LST300 product and support https://www.blackanddecker.com/products/lst300 LST300 model identity; Automatic Feed Spool; Includes AF-100