How would recoating diamond drills even work for any predictable amount of time? The manufacturers have to used all sorts of special equipment to bond the bits of diamond onto the shanks the first place . . . Just wondering - you mean send used burs back to manufacturers? LCM
I know of services rejuvenating expensive industrial tooling...not sure if recoating a cheapo diamond grinder would make any economic sense though. If you really want to save, skip the middle man and go directly to the source...might have to place a minimum order (like 100 pieces or so),but hey, no "dental" mark-up to worry about...