|This tip is once again thanks to my husband. A sewing student of ours who likes to bring her own sewing machine to class, misplaced her spool cap the other night. Without this small part, she could not use her sewing machine for her class, and none of the spool caps for our machines fit her spool pin.
My husband suggested cutting a circle from a piece of stiff cardboard and poking a hole in the center. It worked great! I had heard of people cutting a piece of sponge or cork, but this was easy and quick and readily available! She used it for the entire sewing lesson with no problems!