Check your electromechanical's flipper bushings. These are a common reason
for loose, weak, or floppy flippers. The flipper bushing is the white
plastic piece attached to the underside of the playfield through which the
flipper shaft rotates. It has been estimated that approximately 50% of all
EM flipper bushings are broken. You can get extra-strong new flipper bushings
from most suppliers. These stronger bushings have a flange (the usual
broken part) that is 2mm thicker than the original.