it might not be to hard to replace that melted gear - I suspect the ones under the bobbin though.

Miriam,

Was looking at a parts place, here is the link to their Singer 630 parts:
http://www.sewingpartsonline.com/sin...ine-parts.aspx

Looks like they have most of the gears that machine needs. I'd give it a go ... but then I'm a sucker for an ailing machine. :)

Joe

I'll have to look at that machine again and evaluate the other plastic gears

Thank to everyone. I wouldn't use the break cleaner myself. My husband would use it for me. I got them cleaned up with a toothpick and a small screwdriver. Greased them with Singer grease and it sewed great. I paid $37.45 which included tax and sold it to my neighbor for the same price. I told her about the gears and that if they break I would give her money back. I figured I could salvage parts. It would also be fun to tear one down completely for the learning experience. The machine is in a cabinet, has the original manual, attachments and buttonhole maker. Sandy

I'm pretty sure we are talking about automotive aerosol break cleaner. Sometimes I and others just shorten it to break clean.

Joe