String Trimmer Spool Cap Replacement for Craftsman CMCST920 CMCST960 Series, Trimmer Head Spring Base & Cover Cap Kit, 1 Set Weed Wacker Parts for CMCST920M1 CMCST960E1 Type 1 Quickwind Trimmer

What It Is

This replacement spool cap and spring base cover kit is designed for Craftsman CMCST920 and CMCST960 series string trimmers—specifically the Quickwind models. It secures the trimmer line spool in place and provides the spring tension needed for automatic line advancement during use.

Fitment & Compatibility

Fitment is narrow: only for Craftsman CMCST920M1, CMCST960E1 Type 1, and similar Quickwind trimmers. Before buying, verify your trimmer’s model number (stamped on the housing or under the battery). This is an aftermarket replacement for the OEM cap and spring base—not a universal fit. Check the cap diameter (approx. 2.5 inches) and spring base shape to match your existing assembly. If your trimmer uses a different spool retention system (e.g., bump-feed with a separate spring), this kit won’t work.

Key Things to Know

• Quality: Users report the plastic is durable and matches OEM specs, but it’s not reinforced—avoid overtightening or dropping.
• Installation: Easy swap—no tools needed. Remove the old cap, lift out the spring base, and click the new one in. Takes 2–3 minutes.
• Common gotcha: The spring base must be oriented correctly (flat side down) or the spool won’t advance line. Double-check alignment before reassembling.
• Kit contents: Includes one spool cap, one spring base cover, and the spring—no extra parts or line included.

Should You Buy It

If your Craftsman CMCST920 or CMCST960 Quickwind trimmer has a broken or lost spool cap or spring base, this kit is a cheap, direct fix. It’s not for other brands or models, but for your specific trimmer, it’s a perfect, easy replacement that restores full function.