After much searcing the last few days, I must warn you all that the
Delta GR 050 grinder is a piece of s--t. I hadn't used mine in a while,
and didn't realize the leftover grindings had dried in the bottom and
formed a sort of concrete down under the wheel, basically gluing it in
place. I had poured water into the trough and turned it on. The grinding
wheel immediately shattered into 3 pieces. It is made of a very soft
material, and the center is splined, so the torque of the drive shaft is
sufficient that that little bit of leverage is all it takes to break it.
Oh well, I thought, I'll just order a new wheel. But, Delta's web site
showed no parts could be ordered. Went to my local authorized
Dewalt/Porter Cable/Delta repair place - he can't get it either. He gave
me the toll-free number for Delta: "No, sorry, no replacement parts".
Googled all over, can't find anything similar size. Specialty shops want
double the price of the ^%$@#$$!! machine to make a wheel. It appears
Delta is now in the disposable machine business now. I will certainly be
wary on future purchases!