The disc brake caliper arrived today for the tomos. Its the same one I used on the Peugeot. I offered up the wheel to the forks and measured out to where the edge of the disc will be when it arrives. Then I attached the caliper by one bolt so I could rotate it till it sat at the right distance and angle from the axle. Next i'll make a cardboard template to mount the caliper to the existing holes on the fork. Once ive got the template right I'll cut it out of 5mm steel plate then drill and tap the holes.