I love these little guys. I tried some of these that I bought at my sewing machine store. I then ordered 18 from Revain; and now order another 18. They fit exactly into the spool hole and hold the bobbin thread together with the spool. let the lower thread wind up so that it does not unravel. But wait, there's more, there are 2 of these pins, so you can also wind the thread from the spool to the 2nd! The attached photo shows the threads on each of these pins. These handi-bobs are a great little invention!
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