Sleeving/shimming 28.6 crown for 1" steerer
Kind of an extension of my wide flat crown thread. I can't find a flat crown with 50+ mm tire clearance and 1" steerer, but there are several that fit the bill in 28.6. I really don't want to deal with the OS headset, threadless stem, etc.; I just want a nice traditional front end. I've read that it's possible to braze in a sleeve between a 28.6 crown and a 1" steerer, but have seen no details. I'm assuming that the sleeve must extend from the bottom of the crown to the top of the crown race, and then the crown race is turned down -- essentially shaved off entirely, including the braze/filler -- so that the race seats on the turned-down bit of the sleeve.
Does this sound right? Has anyone had any experience with this? And what are the potential problems?