I have RHTD's on my bike and over the years the exhaust has been removed a number of times. I replaced all the hardware last year because it was giving me trouble. Well after removing them a few weeks ago I apparently overtightened the bolts because the nut that slides in the holding housing is now just spinning. So the nut has to be worn and rounded as it won't hold to loosen. I put plenty of PB Blaster, and tried wedging screwdrivers of various sizes to try to keep the nut in place while I try to loosen the bolt. I was successful on one side and replaced the hardware, but one side is fighting me all the way. If it doesn't come loose shortly I plan to remove the muffler, bag support bar then hack saw the bracket and put the spare bracket with the new hardware. Either way I will have to deal with a worn housing that is supposed to hold the nut firmly in place.
I had the mufflers loosen up last summer and one bracket fell off after a dealer worked on it, so now I do most everything myself, including overtightening hardware. Can't win, either to loose or to tight. This will give me the reason to go to a good 2 into 1 next winter.
Any solutions I haven't tried yet?
Ray G