I'm trying to resurrect a Typhoon 2000 I built years ago on which I unfortunately chose to use this mount and, of course, the rubber blocks are mush. I purchased some material recommended above from McMaster Carr.

Can someone please explain how to remove the isolator mounts from the flat beams; the ones that are held on with locknuts? Using a nut driver, the whole isolator mount spins. The nuts seem to be inserted into T nuts that are flush with the bottom of the beam and I see no way to stop them from spinning.

Thank you.