I'll look everything over in the next day or so. I was kinda frustrated the other night. The holes in these Cometics are pretty tight to the studs. The block was in my first thoughts as well. Then I tried both heads on both sides and the problem moved as if the head was the issue. But like I said I got sort of frustrated and just quit for the night. I'll regroup and check things over again.
Hey, the Trick Flow people are human too, and can make mistakes, so the heads could have a problem I haven't seen. I just wanted to save you some grief exchanging out heads if that wasn't the problem. Let us know what you find.