Jinney:
Post on the Vintage Board & ask if anyone knows of a sewing machine service tech who works on these older machines in your area. There are a few on there that may also be able to help you figure out what is wrong with your machine. You could also ask where to buy a good used one.
Not all industrial machines are greated equal. Mine is a Sailrite & is designed/set up to sew heavy fabrics like sunbrella, tarps, leather, etc. It has a heavy teethed feet dogs & leather walking foot that would rip quilt fabrics to shreds. When buying a machine you need to make sure it's designed to the fabrics you will be using it for.