1hotdawg
+1y
When you loosen it enough it will be able to be turned by hand. It is only a problem if it slips through the opening there...and yes it can do that...been there done that
You can reach your hand up there and tell if that is the problem or not...compare the two sides. The T ends should be pointing forward or backward, not towards the center of the truck. Now, if it hasn't actually turned, it could just not be in the groove...again once you loosen it enough you'll be able to place it properly.