Quoted from cottonm4:My Catacomb has the ball jump over the flipper on occasion. IIRC, some old timers here talked about how the Sterns use to have balls jump over the flippers in the arcades. You could make some sort of dam to bond to the flipper to block the the ball jump. Or just live with it.
When swatting at the ball, it picks up speed and if the player swats it away again it comes back even faster and can sometimes deflect over the flipper. In tournaments when playing against young inexperienced opponents I frequently see this and the player yells 'I hate this machine'. I shrug and say tuff luck kid.
If you play under control and let the ball dead bounce to the opposite flipper you can slow the ball down and shoot more accurately for higher scores and minimize airballs and brick shot drains.