Haven't been on for a while, have some catching up to do. I have a problem I hope someone can help me with. I have a 66--16 in a cabinet with knee control. My daughter got it at an auction house for $25.00. It's in beautiful shape, both machine and cabinet. I have used it a lot and it has a nice stitch. The problem is when I have to replace the bobbin. The thread won't seat in the second grove. It slips out and then I get a bad stitch. Can anyone help with this? Is there a trick I should know? It takes forever to get it right and I lose sewing time and patience. Thanks. Linda