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String trimmer bump knob (or spool retainer) with left-hand threads. Color: red.
Genuine OEM Part - Manufacturer #308042003
Cap-retainer spool
Genuine OEM Part - Manufacturer #125-8252
Bump knob. Fits Stihl# 40047104000.
Aftermarket (Non-OEM) Part - Manufacturer #385-876
Cap assy .080 rh
Genuine OEM Part - Manufacturer #530054223