Quoted from jardine:My manual plunger isn't centered on the ball either. Can you explain how you fixed this?? I am sitting to the left slightly when you look down on it! Would love this to be centered on the ball so I don't have to hold the top flipper up to make the loop.
If you lift the playfield, the shooter housing is held in place by 5 screws. Loosen the screws and the housing will have some play to move it around a bit. Every game will be a bit different on where to move it. With a little trial and error you can figure out a location that gets the plunger centered on the ball. Push the plunger all the way foward to help determine the alignment on the ball.