Used to use similar hollow milling bits when I was younger working in the steelshop. Like you say, they were so hard, but if you knocked them, it was like they were made of glass!
if you just need bearings, they can be had pretty cheap from ebay. im with you tho, i havent used mine enough to worry about wearing anything out yet haha
i used to do some sheetmetal/hvac stuff for a friend. i thought i had forearm strength... using a 6” hole cutter with the dewalt corded drill he had was dangerous...
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