You need to remove the little spring thing in the metal bobbin casing for the genie to work. It comes our easy and goes back in easy.

I have used them in my Pfaff Creative 2.0. It seems to make the thread reel off more smoothly and it definitely has helped me with birds' nests. However, when I got my machine serviced a month ago, the person at the sewing machine store told me that it needed a timing adjustment. I haven't had a problem with birds' nests since, but I've only used Pfaff plastic bobbins since I got it back. But I'm holding on to those bobbin washers if the problem arises again.

I use them all the time and love them!

I use them in my longarm and LOVE them. Ive also trimmed them down to fit my domestic machine as well. Well worth using!

I had no idea what there were so I went to Nancy's notions to look at them. Now I know and I think I will buy some and try it out. Many of you here say it is great. I learn so much here (sigh)

I have asked and supposedly they will not work in a Bernina. I've been told not to even try it. Boo Hoo!

Never heard of em, will have to check em out!

I use them in my Pfaff, especially when doing a zig-zag stitch as my machine bobbin seems to slip at that time. They work well & my stitch improves when I use them.

I have them and they work pretty good. They come several in a pack so as soon as the "birdnest" starts up again, you need to change it. I've tricked it out by flipping it over and get a little more life out of it. they're inexpensive enough to give them a try and see if you like them.

I don't see a difference at all. I have a Brother with a top loading bobbin and still see plenty of movement in the bobbin because there is space above it with or without the washer.