I recently bought a 403a slant-o-matic at an auction. It's in a cherry wood cabinet and I paid $2.50 for it. As I was cleaning and oiling it I noticed the throat plate, where the needle goes up and down, looks like it has been scrapped by the needle. The needle rubs on it as it sews. I thought the needle might be bent so I changed that but it didn't help. There wasn't a bobbin with it so I don't know if it will actually sew stitches.
I'm wondering if there could be an obvious problem with it, like something that happens to these older machines when they've had years of use. If it doesn't end up being to costly I might get it fixed but I'm just wondering if anyone might have an idea about what the problem could be.