We purchased a 29-4 singer leather sewing machine, tore it down and cleaned it. It is back together and won't stitch. I'm relatively certain it is threaded correctly, but the bobbin won't catch the top thread to make the stitch. When we first bought it it did stitch. The little pin that holds the needle plate in place was broken. In replacing that we decided the entire thing should be torn apart and layers of grease and dirt scraped off.
Any light you could shed on this problem would be appreciated.
Jeri