Quoted from MightyGrave:
Installed the variac (while power fix for Europe is not availble at the moment) and it worked good but now after a fews days the catapult is down to 50 - 70% ....
Sometimes its pretty constant and then it goes to right or in front oft the trunk.
I cleaned all parts of the catapult and now i'm out oft ideas.
What else can i do. Read about the dremelmethod, but im not sure how to adjust the arm or the whole assembly.
Hope you can help me and. Give me some input.
Dont bother with the arm itself, there isn't much to do there.
Move the whole mech itself. It's a much better solution.
If you raise the playfield and lean it all the way back, you can easily see the whole mech.
Its held in by 4 screws.
It's very accessable with nothing around it.
It's easily removed and replaced.
You dont even have to disconnect any wires, or move any.
Side cut the metal holes that mount the mech to an oval or oblong shape about 2mm each on the sides of each hole so that you can reinstall it with room for adjustment.
Its thin soft metal. A drill bit smaller than the hole can be used to carve the edges with a little patience if you dont have a dremel.
Upon reassembly you can now turn the mech slightly for a better alignment to the trunk
Its pretty easy and takes about 10 minutes to do.
A little bit of adjustment is all that is needed as its 22" away from the trunk.
A 1mm change is dramatic.
Sometimes there is enough slop in the holes to just loosen the screws and twist the mech to the left or right and tighten while firmly holding it in place.
Most will probably have to be rotated clockwise a little if the catapult fires too much to the right.
Mine had to be turned about 2mm in order to aim it where it needed to go, so I carved the sides of the mounting holes in the mech to get a little more turning adjustment.
It seems to be best if the ball ends up in the left of center of the trunk initially.
Power variations usually fire the balk to the right.
This way there is room for error.