Originally Posted by mom2boys

I have a quick question I have a singer 66 that I purchased on craigslist for $10, follwed Billy's great directions and cleaned it all up. Now I'm trying to get some test sews on it and I think the bobbins that came with it are wrong. The person gave me a metal bobbin that is the same size as the prewound Class 15's that fit in my Brother CS80 & Kenmore machine. When I try that bobbin all the upper thread goes under.
I put a Singer 15 plastic bobbin in the machine and it sews great but these don't look like the one I see online, they are flat on top not curved like the pictures look to me.

Thanks for all the help:)
Ginger