I have this old coin acceptor that I can't figure out. I'm new to this, so hopefully it is something easy to figure out. Every coin I put in goes straight through and falls out the return side. It came out of a nickel slot machine (which didn't work at all when I bought it), so as far as I know it is for nickels, but it may have been changed to quarters at some point because there were a couple quarters (as well as nickels) inside the machine. Either way, I've tried every coin I could and nothing works. Is anyone familiar with these who can look at the pictures and tell me if something is broken/missing/etc?