I've been working on getting our NTU pup roadworthy and ran into an unexpected snag. We were putting it down last night after working on it and about halfway through cranking the top down something happened (no noise or anything) and all of a sudden the crank handle got "heavy" and the roof wouldn't stay up unless you were holding the crank handle in place. The roof will still go up and down, but if you let go of the crank handle it would topple down. Can anyone tell me what might have happened and how I go about fixing it? Thanks in advance!