Quoted from TimBoch:
I just picked up an IJ yesterday and my right drop target has almost the exact same issue. I would be curious to see what any experienced owners have to say.
Quoted from Billc479:
Don't forget that one of the drop targets is thinner than the other two. If they have been replaced, its possible someone did not realize that. Refer to the parts book.
Note that the parts listed in the manual are correct, but the diagram for the 3-bank is wrong - all four drops in the game are wedge topped. Part numbers listed as 03-8750 and 03-8033 - these are the exact same interchangable target. If you use the thin-topped targets, your ball is going to get hung up there.
If your target isn't dropping properly, check two things:
1. Make sure your springs are still tight and in good shape. You can increase the tension here, if all else fails.
2. The drop target has a guide track inside it. A washer slides up and down this track to keep things in place. If there's any friction here, your target can stall. I had a washer here that was just a tiny bit misshapen, and I had to either replace the washers or grind them down the slightest bit to prevent this friction.
It can be hard to diagnose this - I couldn't see any problem with the washer, but running it up and down the track with my finger revealed the problem.