I have a stainless steel* split shaft collar type item that needs to be embiggened. Its inner bore is 1.25" now, but I need to increase it to 1.35" and the thing is 0.6" thick.
As a one-off thing, am I insane for thinking I could do it a half-round file, or can I put a 1.25" sanding drum with an appropriate abrasive in my drill press and wobble the thing around to make the hole larger? Or a cylindrical grinding stone? The ID is not concentric to the OD, so just chucking the thing on a lathe to buzz off that tenth is not happening.
*No idea what grade, probably 304. Not magnetic.