Bought my first pontoon (1989) with a great 4 stroke engine, and loved it except for one thing. The rear supports for the hard top would make an annoying squeaking noise. Tightening the bolts would stop the noise for a while, then the noise would return. After dropping the top I found the holes that held the bottom supports were wallered out (if that is one way of saying). Is this a common problem with a hard top and how can it be repaired?