Quoted from chuckwurt:Maybe try a longer coil stop? I just rebuilt my sys 11 game with no issue from a kit from PBL. If you look at this picture, the plunger link looks diffferent than yours. Maybe you got a slightly different part that isn't quite fitting?
http://www.pinballlife.com/index.php?p=product&id=976
The op used a WPC style flipper kit, not a sys 11 kit. (You can tell as a sys 11 uses a compression spring, not an expansion spring).
Op: did you put the insert (metal ring) into the link when you did the rebuild?