I just found a singer touch and sew zigzag model 758 at a garage sale for $2. The feed dogs are really flat (not sure what someone did to them), the bobbin case is apart, and the bobbin itself is in two parts (not sure if this is normal). My local shop wants $50 to tune it up plus whatever else it needs (mystery). From this board I've read that this machine has nylon gears. I was hoping it was metal. Is it worth keeping/fixing or should I buy an inexpensive machine at walmart?