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Think brake disks from metal will work better... Could not resist, I'll get my coat.

Hi Neo all sorted now had to adjust spring length but all working good now. Cheers Graham

hi Graham Not sure if this helps but this is my 1978 DT175MX rear brake light set up. and the other end of the spring goes on the top part of the brake pedal the switch part points down towards the pedal, and is held on by the plastic nut. It fits in a welded ring on the frame. The long spring attaches to the 'pull out' plunger and the other end attaches to a hole in the top of the brake pedal. When you depress the rear brake , it pulls the plunger out and this makes the internal switch close and the rear light goes on. I appreciate yours may be different but it may be helpful. NE0