Most pinball machines have a small roll pin inserted in the playfield just
below each flipper. This is a guide for alignment. Use a pin or nail (I
use a small allen wrench) in the hole to help you position the flipper for
alignment. The plastic, not the rubber, of the flipper is intended to be
aligned with this hole. A slick way to handle this is to pull the rubber
slightly out from the flipper plastic and slip the pin or nail between the
rubber and the plastic into the hole. This will hold the flipper in place
as you tighten the set screws or clamp bolt underneath. This is especially
great because this holds the flipper in the proper position with the
playfield up.
Note that if the flipper shaft contains serious indentations from the set
screws you may have a tough time getting the alignment right if the
indentations are in the wrong place, even with this set up. If this is the
case, you may want to try filing the shaft to remove or widen the marks, or
you can try swapping left and right flippers to solve the problem.
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