I have ground and heated up and bent all kinds of wrenchs to snake around and work on old brit bikes. I needed a special clutch hub took for a honda turbo bike and they wanted like $60 for a tool I would use once. I miked the hub nut, went to a pawn shop and bought a socket for $1, then welded 4 pieces of key stock to it to make the tool. I have also taken pawn shop wrenchs, cut em down and welded sockets to them to make offset tools. To remove a stuck brake drum I took a big 12" 3 jaw puller, and made some reallly long binders for it out of 1/8" stock and then attached the pulling jaws to that. Worked great. Had a busted/rusted spin adjuster and couldn't back the thing off on a stuck rear wheel. Had to cut the pins, then jerk the wheel over the brake shoes to get the thing off. Boy was that a royal pain in the tush. I also have welded pawn shop sockets to a metal rod, vice gripped the rod to the frame, and then used that crud socket as a drift (for king pins). Another handy tool was a big heavy piece of copper, heated and smushed into a spoon to use behind sheet metal with the wire welder. This wicks away the heat and prevents burn through. You can see the tool if you follow my link to my 47 jeep.
Other than that...nah...don't mess with custom made tools much....
