THTEN SF-080 Trimmer Spools Cap Covers Compatible with Black Decker GH3000 LST540 Weed Eater with 90583594 Cap Covers Parts Auto-Feed Single Line (2 Pack)

What It Is

This is a 2-pack of replacement cap covers for auto-feed single-line trimmer spools, designed to fit Black+Decker and Weed Eater string trimmers. The cap secures the spool in place and houses the auto-feed mechanism; if yours is cracked, broken, or lost, this restores normal line feeding.

Fitment & Compatibility

• Direct fit for Black+Decker models GH3000, LST540, and compatible Weed Eater trimmers using OEM part #90583594.
• Check your model number on the trimmer’s label (under the handle or near the motor housing). This cap does not fit GH900, LST136, or most Craftsman/other-brand trimmers.
• Measure the spool housing diameter – this cap is for standard 2.5” spool housings. If your current cap is larger or smaller, it won’t seal properly.
• Not compatible with bump-feed or dual-line spools; only works with single-line auto-feed systems.

Key Things to Know

• Installation is easy – remove the old cap (may require prying if stuck), align the tabs, and snap the new one on. No tools needed.
• Quality is decent for the price – plastic is slightly thinner than OEM but holds up for a season or two of regular use. Avoid overtightening or dropping on concrete.
• Common gotcha: The cap may be tight the first time – use a flathead screwdriver wrapped in tape to gently pry it off later. Don’t force it.
• Two-pack is smart – keep a spare in your garage; these caps are easy to lose or crack when hitting rocks/curbs.

Should You Buy It

If you own a compatible Black+Decker or Weed Eater trimmer and need a quick, affordable fix for a cracked or missing cap, this is a solid choice. It’s not built like OEM but works reliably for the price. Skip it if you have a different brand or a dual-line/bump-feed system.