thank you so much- all these posts are helpful

I bought them to try to stop the bobbin in my HUS/VIK from spinning faster than it needed to at times. I think it helped as it isn't something I pay attention to I only notice when there is a problem and I have been sewing pretty free of bobbin problems since I put one in. I'm glad I have them.

I have them in all my vertical bobbin machines - vintage Singers and Kenmores. The difference they made in the appearance of the backs of my quilts was incredible.

I got them from daystyledesigns - Leah Day's site.

Thank you