the Zaxxon at work a couple years ago had like a double image thing that kind of looks like this. the vertical card (adjustment card?) has a little silver box with a red knob inside it that controls this. that part was broken on the card, Arcadecup sent me another card to just drop in instead. it's a pretty delicate part to adjust, I guess they break easily, but you can verify that the solder's good to it too when you go to cap it.
4600s are awesome when they work. too many delicate parts to break, like those stupid width coils. which when you go to pull it out, I encourage you just desolder or cut the wires and solder them back on when you're done. I'm led to believe the wire orders don't matter, but you can mark a wire and post with a sharpie to put it back the exact way it was.