Depends on what game you're converting on. 3" flippers on a 2" flipper game would not be an improvement at all. The ball would almost never drain down the middle. Targets, etc in the middle of the playfield could be damaged easily as some are closer to the flips. It might work on a game like Gtb. Aloha, but, the integrity of the game is lost as there are no side outlanes on this game. It'd be impossible to lose!

I don't think the ball would even fit between the flippers when energized on the game pictured above, (Mibs).