Quoted from jazzmaster:
Yep...open ticket. Bowling Alley has done nothing but stutter from day one...utterly useless mech.
working through that myself, and actually was looking at the Bowling Mech in the CT TBL this weekend. On the CT TBL, they had a nylon washer between the launcher mech and the motor. I don't believe mine had that washer.
Before seeing the mech this weekend I had removed my launcher a number of times and reinstalled it. I still have to do some more adjusting, but now I only have a double stutter on the far right sweep. I am also seeing where when trying to pick up a spare, you can hit the pin dead on and it won't register.
I think with a little more adjusting I can get it. I am starting to think that the stutter is coming from an adjustment on the right roller switch rather than the position of the launcher, but will advise.
Two things I would do.
---adjust the launcher up on the motor shaft.
There is a 2.5 mm set screw that is holding the mech to the shaft. Blind entry into the hole where the set screw is in the launcher under the BA pf, but you can feel for it. Its right between the two mounting brackets of the motor to the playfield on the right hand side of the bowling alley. I would loosen that up, move the launcher up the shaft a little and then test it. Don't move it up too much or you will allow the small roller switches to open completely. If that happens, grab some small allen wrenches. There are some small holes that you can feed the small allen wrench in and hold the switch back so the launcher will slide down flat with the BA PF. I think one of the issues I was having was the launcher dragging. Moving it up on the shaft might have removed this. Mine runs very smooth now
---Test with a ball in the launcher.
One thing I noticed in test. I could test the launcher in test mode and it would move side to side fine, but when a ball was in the launcher, it seemed to want to be jerky, and act funny. So get a ball in the launcher and test the side to side movement with the ball in the launcher.