How-To Spool Caps
A spool cap is designed to keep the thread spool on the machine as you sew. But if you have ever had your thread catch on the spool cap it can be quite frustrating. To keep your thread from catching on the spool cap and breaking, match the size of the spool cap with the size of the thread spool. When in doubt, use a spool cap smaller than the spool.
Lost your spool cap? Only have one size? Find a retailer in your area to get more.