I CANNOT get the brake pad holders to undo on the brakes I took off the Kuwahara. I was in a hurry and needed to finish that bike, so I swapped the canti brake arms from my own touring bike for the Kuwahara's, thinking I'd just let the Kuwie's brake arms sit in some penetrating oil and I could undo them later. But I can't! And now my touring bike does not have front brakes!! I can't put these ones on with the existing brake pads because those things are 20 years old and the consistency of granite.

So does anyone have either a surefire trick for undoing stuck nuts, or know where I can get a pair of short-arm cantilever brakes in Calgary?