Quoted from smassa:
You must not be going to the lower PF as much as me. Bashing on the edges of those targets will make them shift over again.
I agree : each time I re-adjust them, it shifts again after a few games only
Quoted from SealClubber:
push it over and tighten it bit
It doesn't work for me. And it is really not easy to adjust : the targets shift by themselves when you tighten the 2 screws that hold them...