Re: Tensioner pulley
When ever a bolt is starting to strip, you can install a threaded stud that will thread ALL the way into the female thread. Use thread locker to hold it and use a nut for the clamping.
As compared to a bolt, a stud has full thread engagement to your advantage. THis will provide better support and reduce the risk of pulling out the remaining threads in the female portion of an assembly.
Best of luck to you, Woody