I have a Gorgar machine in which the red arrow tips near the side 1-2-3-4 stand up targets are a bit lifted. I can push down on them but the pop right back up. What's the best way to fix this? If the ball is rolling slowly enough, the lifted tip will change the trajectory of the ball. Should I just replace them? Would that mean heating up the insert (from underneath), knocking it out, and gluing in a new one? I'm very new to do much work on machines. Just basic stuff.