Small Line Cart Brake (Ref. 416157601)

One of the most frequently lost exterior parts. The spool cap (spool holder) is the essential plastic disc that is placed on your sewing machine's horizontal pin to securely hold the spool of thread during operation.
This is the Small size version, ideal for use with narrower spools or thread tubes. Using this cap prevents the spool from jumping during sewing and ensures that the thread does not get caught or tangled on the plastic edges, avoiding thread breakage and skipped stitches.
(Original reference and equivalents: 416157601)