I have many bally linear flipper restored and they all work good, no ball rebound at all. If the ball rebound on the flipper, change the stopper, also check the alignement and the sleeve. That should not happen.

Because the sitting face is new flat and complete, the shaft will sit better and i also recommend changing the shaft or grind the face flat.
Result is the flipper is lot more stable and no more bouncing ball.

Here's mine, it was in storage for 7 years.
It's was a project machine and i worked 1 month on it to make it
working nicely. The 7 digits conversion done.
Next winter, i would like to restore the playfield. It's a very nice example with a full mylar.

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