Originally Posted by
Sunnye
My repair man told me NOT to use them. They make the bobbin spin around even though you've stopped sewing. He says they are bad for the machines.
That doesn't make any sense. Only a strong centrifugal force will keep a bobbin spinning after you stop sewing and a threaded bobbin won't allow that to happen anyway. All the washers do is stop static electricity build up which causes bird nests. I use them in all my machines that have a metal bobbin case. You need to take the tension disc out of the bobbin case. It's easy to take out and put back in. I like them and have been using them since they first became available to use. Before the washers I used liquid silicone and put a teeny tiny drop in the bobbin case.