New to me Machine

[Modkuo]

Hi everone. I was able to try the machine out and the ball feeder to the shooting mechanism is not feeding smoothly....requires a bit of jiggling for the ball to come down the ramp into the loading area. see pic. I did look at the back area, what do I need to remove to access, and any tips on what to clean better or look for? any specific lubricating needed in this area?

the light, bell and payout seem to work ok, the ball dump tray and that dump route need to be a bit smoother also.

THANKS !