If it runs and you accept the donation amount with out hesitating it's worth keeping. Personally I have all metal machines on top of my list, but I have to add my favorite zigzag models have a few plastic gears, a vintage Bernina Record for the perect zigzag and well behaved manner, and an Elna Supermatic for it's double layer cam and nice freearm. If you are looking for stretchy stitches, there is hardly a single all metal model out there, the exception being a few 1950s Necchi and Adler models.
I would replace a cracked gear on a nice model, and spend a bit of time and effort on it. I have been interested in the fancy bobbin functions of the Touch & Sew machines. You need to spend a bit of time with these features before you get accustomed to your new machine. I think it should be worth it. A nice condition machine like yours, complete with all accessories, straight stitch and chain stitch plates is not that common. It's actually quite a find!
Last edited by Mickey2; 02-24-2018 at 06:26 PM.