Candace

I don't need them and I own close to 30 sewing machines.

annesthreads

I use them on one of my machines which is very temperamental when asked to do FMQ, and they do help keep the tension correct.

DOTTYMO

I was told they stop the bunching on the back. No idea waiting for a delivery sooooooon.

michelleoc

I've put them in my sewing machines and haven't had any eyelashes on the back or other tension problems.

Painiacs

I tried them but with my top loading bobbins it wouldnt fit right. Will try in 5he 15- 91!! Otherwise send them to friend with LA!!:-)