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The button makes contact with a metal (or plastic) strip that moves in and out of an opto unit. If the strip is worn it loses its 'spring'.
The left flipper button on the IJ i got from you had a screw inserted into it to compensate for this loss of 'spring' so the strip would properly clear the opto unit. This made it hard to make the POA shot becasue the 'stroke' of the flipper had changed, making the flipper that little bit more sensitive than the right. The buttons can also wear, getting 'sloppy' with age and this can also cause the strip not to clear the opto unit.
Only way to make it good is to buy a new metal (or plastic) strip, and new buttons. Got mine from Marco.