LST300 line & automatic-feed round
Check the documented line specification, seat the original spool and diagnose remaining feed trouble.
A consumable-fit and spool/feed record for the exact tool type.
Match before starting
Choose the versions you can confirm.
Have ready
- Correct AF-100 spool or exactly specified line
- The matching model/type manual
- Good light
Your care order
Each task keeps its own checks and observations. Return here to review the whole round.
- Stage 1
Check the replacement line specification →
Match round nylon line and the original AF-100 single-line head.
No result recorded yet.
- Stage 2
Replace the cutting-line spool →
Fit the spool in the order shown by the matching tool-type manual.
No result recorded yet.
- Stage 3
Check automatic line feed failure →
If feed is still wrong, use the automatic-feed route; do not bump the head.
No result recorded yet.
Consumables that fit
| Item | Specification & fit | Do not substitute |
|---|---|---|
| Factory-wound replacement spool | BLACK+DECKER AF-100; 0.065 inch (1.65 mm) round nylon monofilament Original LST300 automatic single-line head, after exact tool-type/manual match | Bump-feed or dual-line heads; metal, serrated or heavier line; unverified replacement headsEnglish p9 Cutting line / Line feeding; Replacement accessories |
| Bulk cutting line | 0.065 inch (1.65 mm) round nylon monofilament Intact original AF-100 spool with the slot, adjacent anchor hole, arrow and fill recesses in figs P–R | Serrated, square, heavier or metal line; different anchor geometryEnglish p10 Rewinding spool from bulk line; figs P–R |
| Replacement spool cap | BLACK+DECKER RC-100, confirmed against the exact tool-type parts list Original compatible AF-100 housing with undamaged slots | Damaged housing; caps with different tabs; forcing an apparently similar partEnglish p9 Cutting line / Line feeding; Replacement accessories |
| Factory-wound replacement spool | BLACK+DECKER AF-100; 0.065 inch (1.65 mm) round nylon monofilament Original LST300 automatic single-line head, after exact tool-type/manual match | Bump-feed or dual-line heads; metal, serrated or heavier line; unverified replacement headsEnglish p9 Cutting line / Line feeding; Replacement accessories |
| Replacement spool cap | BLACK+DECKER RC-100, confirmed against the exact tool-type parts list Original compatible AF-100 housing with undamaged slots | Damaged housing; caps with different tabs; forcing an apparently similar partEnglish p9 Cutting line / Line feeding; Replacement accessories |
| Factory-wound replacement spool | BLACK+DECKER AF-100; 0.065 inch (1.65 mm) round nylon monofilament Original LST300 automatic single-line head, after exact tool-type/manual match | Bump-feed or dual-line heads; metal, serrated or heavier line; unverified replacement headsEnglish p9 Cutting line / Line feeding; Replacement accessories |
| Bulk cutting line | 0.065 inch (1.65 mm) round nylon monofilament Intact original AF-100 spool with the slot, adjacent anchor hole, arrow and fill recesses in figs P–R | Serrated, square, heavier or metal line; different anchor geometryEnglish p10 Rewinding spool from bulk line; figs P–R |
Keep the complete pack
The ZIP includes these three guides, your current task records and your care plan. Add a date to include a calendar reminder.
Sources
- BLACK+DECKER LST300 instruction manual (manufacturer document, retailer-hosted)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 · Checked 2026-10-13
- BLACK+DECKER: locate a manual using model and type numberOfficial model/type lookup instructions; type is beside or below the model number · Checked 2026-10-13
- BLACK+DECKER LST300 product and supportLST300 model identity; Automatic Feed Spool; Includes AF-100 · Checked 2026-10-13