Hi! Sorry to post another dumb question. Yesterday I noticed that my front brake pads were badly worn. As a quick fix I picked up some brake pads from Asda (I know, I know!). These pads were labeled "fits most common cantilever brake types". The pads have a nut and three washers, the pads on my bike have a kind of metal bar attached that's much longer than the nut and washer contraption. What's the name for the type of pads I need? Do I have "uncommon" cantilever brakes?