Anyone found trouble removing the 1/4 turn plastic screws at the rear of the tank ? I bought the bike used and my guess is the shrouds have been removed at some point incorrectly. The screws turn. I can feel resistance but they don’t pop up like they should. I’ve tried grasping the head and pulling while turning, without success. I’m stuck with drilling the head off at this point, but wondered if anyone had a better solution ?