I was installing mud flaps today. After installing one of the rear flaps I tugged at it to see if it was on tight. The entire rear quarter panel moved, which concerned me a little. Then I noticed that there were some thumbscrews (about 5) that hold the inner fender to the car. They were all quite loose. I tightened them finger tight (not very tight, IOW) and the rear quarter panel no longer moves around. Here's a picture of two of the thumbscrews: Here's my question: Are they supposed to be loose, finger tight or tight? (Maybe they're supposed to be loose to prevent squeaking or comething). Any ideas?