Here is a Mill's Slot Machine "777". This repair had to start with a full de-grease procedure. You can see some of the ugly, before pictures, after the clean re-greased pictures up first. The slot would not pay-out at all. The payout slides were gummed up with grease and several stuck coins. Also, the reels would spin slow, if at all. We replaced a few springs, cleaned the clock, cleaned up the relays in the cabinet and other general adjustments.
After the job was done, Kerry made sure this game worked perfectly. Over and over again. <grin>