I bought a 3" pocket stone (coarse, of course) from Ace hardware and permeated the thing with 3-in-1 oil, hooked up the 1717 to my MMM, and held it at full throttle for short bursts while I pressed the stone into it. I only do short bursts and then stop to let it cool but so far I've been at it for 2 hours and still have some grinding to do before it's done. I tried a magnet and a paper towel but nothing seemed to be able to keep all of the metal shards out of the front bearing and now it's making a bit of noise. I've been cleaning it out and flushing 3-in-1 oil through it but I suspect I will need to replace it
Why oh why couldn't they give us a 5mm shaft....