UPDATE 3 Years Later-SOLVED-Craftsman V20 Weed Wacker String Replacement-Cap Replacement

[@Hipiam]

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[@skygirl81103]

I have the same trimmer, CMCST900, my spool housing (part #10) keeps slipping down. Not all the out, but loose. I can push it back in place, but it won't stay. Any advice on how to fix this? If not, no worries!! Just thought I'd ask :) thanks!!