Yep, had the same problem myself. Below is what I had posted last year,
should solve your problem. I had called Delta and they sent me a new pully,
but I did this fix in the meantime and it's still good.
For those of you with one of these who may have a problem with the bushing
separating from the upper rear belt pulley, I found it's easy enough to fix.
First move speed indicator to fastest speed, this loossens(relaxes) belt,
then it's not too difficult to release the spring. After you get the upper
pulley off, drill and tap a 10-32 hole and install a set screw to hold
bushing in place. To re install spring I just compressed it in a vise and
tied it with plastic tie straps to hold it while I got the keeper ring back
on, then cut the tie straps and pulled em out. Hope this helps someone.
Just to let you know, the new pulley arrived today before I could get to
fixing the problem. I noticed immediately that Delta has made your
modification to the rear pulley bushing in the newer design.
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