I am re-purposing my old CX brakes (Avid Shorty 4's) for a new commuter I a building on a Nashbar X frame. I was wondering if anyone has converted road cartridge pad holders to Cantilever pad holders. The road pad screw is too short. ,Does anyone think I could convert a road pad holder to a canti pad holder with some washers off of some old non-cartridge pads?

I know Kool stop makes a road pad holder that easily attaches to cantilever brakes. I used a set to significantly decrease the fork judder on my cross bike. I am trying to avoid spending another $22 bus for new pad holders. Any help is appreciated.