Old thread but topic should be timeless.
Very recently I tried to put some braze on cable stops and bottle bosses on my Raleigh Competition. Admittedly I'm not a welder, brazer or solderer. But I've always managed to make it look good enough for other things.
Being very low on both O2 and acetylene I rushed too much. It looks crappy. A bottle boss doesn't line up quite right. I didn't even get the down tube stops on good before I ran out of acetylene. Not wanting to spend several hundred to get my bottles refilled as this will probably be the last time I'd ever want to use them. Don't think propane or MAP gas torch will get the job done.
Sadly my Raleigh might be toast unless I can find someone to fix it for me.