Sounds bad to me. Your driveshaft coupling has a softened area around the bolts. There are numerous holes built into the disc at these points. This area breaks down and the sleeve and bolt move around in a much larger hole. Get the new disc and you will see what I'm talking about.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician