I've got a CP die grinder, picked it up from a used tool store for $15. I cleaned up a 292 head with about 3-5 years ago. The compressor I used at the time was a big one, 2 stage compressor 80 gal tank. The compressor was about the size of a big Harley. The die grinder just screamed cleaning up the head. That compressor isn't available for use, unless I want to travel a 100 mi.. I just cleaned up another 292 head. The compressor I used was one that was given to me, burnt motor. I put a 1hp motor from Harbor Frieght on it. The die grinder starts out good and slowly it downs about 60# on the tank and I back off and look at how things are going. The tank gets back up to about 120# and I go thru the process again. I wore out a Dremel on a set of air cooled VW heads. The Dremel never slowed down unless I pressed hard. Merit sanding disks and little flapper wheels. I tried using the Foredom I've got now to fine tune the work I did on the 292 head. The handle that holds the bit is a little nicer to work with than the dremel. The handle does get pretty warm with prolonged use. I've got well lubed. I need some more bits for, I find them I might take another try at the head. That makes me think of a difference between the dremel and die grinder. The bit shaft 1/8 for the dremel and a 1/4 for the die grinder. I did see a Dotco on that auction site and it had 1/4 and 1/8 collets, I was real tempted.
Larry
