The speedo on my WM20 packed up 6 years ago although the mileage recorder was ok, every speedo repairer i phoned wanted approx £150..sod that, so i fitted a halfords cycle one!thats been ok till battery died,so yesterday i had a go at the Smiths speedo myself..after trying everything to remove bezel (hot water,blowlamp,oilfilter strap,diesel) i eventually used a pair of 24" stillsons! hooray its off, then took internals out,removed needle,face then had a good clean with petrol, i found that the brass drive wheel on the main shaft had worn out at the top edge,after removing the cartridge(the bit with all the bells and whistles on)I removed mainshaft and saw that the gear is just a press fit on splines, i took off the brass gear and found that the bottom edge had no wear at all, so i just turned the gear over so the unworn part could contact the gear on the cartridge,reassembled everything and it only bloody works, total time 2hrs cost blood and sweat! now got more beer money