Uss 8-64

I have a uss 8 64, and I don't think the coin mechanism works correctly.  When I put a coin in, it just drops directly to where the change box should be (I don't have one), and the knob won't turn.  Any suggestions are appreciated.
Ben

[BryanH]

Bminer - read through this forum for general cleaning...  The mechs oftern get gummed up after 30 - 40 yrs use.  JohnieG has some great tips.  If cleaning doesn't get things working then it might require adjustments. Again JohnieG's posts are very helpful.  Finally if it doesn't work, JohnieG (am I repeating myself?) has started a repair business that's worth checking out.

[Pat Pixley]

Hey Ben, Johnie also rebuild  coin mech's. And he is fare
  on doing them   Drop him a email he a great guy.