I'm not worried about the finish on the bike at all, either in terms of damage done while in use of the mount or in removal if it ever comes to that. Essentially I'm just wondering if anyone has done it before, and if it will hold over time.
If you aren't worried about the finish (ie: you have a rattle-can handy) then how about brazing/silver soldering on a boss?
I just brazed on two of these downtube shifter bosses
onto my new Urban Assualt® Fuji with custom Banshee® bars
