Common on older boats that are well used. I have the same problem. Although there was no thud sound. Just worn pylon to corner casting bolt holes. there are a few ways to fix this. If the wear is as bad as i think it is, you can check it out by removing the bolts in one side at a time and carefuly lifting the rail off of the pylon. Wiggle the one hull a bit and see if it lifts off easily. you'll probably find it comes off easy and the bolt hole is very worn. The bolts in my boat were already oversized. If yours are not, maybe that will work. Repairs range from epoxying the castings back on, to installing bushings and shimming, to making oak fillers for the pylons and redrilling the holes. If you are good with this kind of thing, it's just fun busy work. If your not, find someone who is. I'm gonna do mine this winter when i dont want to freeze my butt off in the ocean.
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