Quoted from vid1900:
The Flipper Bushing is what keeps the flipper from dragging on the playfield and ruining it.
When you see games with two "angel wings" carved into the playfield in front of the flippers, you know nobody ever replaced the Bushings.
We, of course, ALWAYS replace the Bushings when rebuilding the flippers.
Even if the flippers are not dragging on the playfield (yet), they will often have too much play because the Bushing holes have become worn.
Remove the 3 nuts and the Bushing will pull right out.
Never seen shank screws used for older games, but it sounds in theory to be a nice option to avoid the constant problem with loose bushing screws, especially on those Williams EMs sporting DC flippers; my only concern with this method - would the screw heads show on the P/F?