Quoted from trk12fire:
This machine has to be the funnest machine to mod. The shifter came in and looks great. The set screws will ensure the knob won’t move. The knob does have a little weight to it. Hopefully that won’t be a problem. I had know idea you could shift down in this game.
That down shift switch can be an occasional source of credit dot too. If you tend to never use it, after enough time (~30 games or ~100 balls) where the game doesn't see the switch made at least once, it will throw up the error code. Use it just once and the error will reset itself and go away.