Al, I decided to replace the bolts because it looks like the bolts had never been tightened from day one. I think it was last fall, during winterizing, that I found all four bolts were loose. I removed one at that time, and found that the threads that weren't covered by the nuts had been flattened from being worked back and forth. I'm guessing, seeing that damage, that these bolts had never been tightened. I just felt better replaceing them... but then, right on cue, I had issues (the galling). It's all good now, but just frustrating. The old studs were in decent shape besides the flattened threads.