I've almost finished my "track" bike, and would like to convert my KHS (Mercier) to a fixed/free "road bike" style with two brakes. The frame's drilled for a rear brake but has no cable guides. I have the option of sending the frame off to have guides (and bottle bosses) installed, but I'm also thinking of JBWelding some guides onto the top tube and getting a seatpost-mounted cage. I may still have it done professionally, but I'd like to know if JBWeld is strong enough to hold cable guides onto a frame. No, I don't want to use tape, zip ties or anything temporary. I know there are clamps made for this purpose, but the top tube's a bit large for those, and they belong on lugged frames anyhow, so that's out. Not moving quickly here, so I have time. Any suggestions?