Hi, I bit the bullet and cut the clamp off an aluminium NOS Osgear
quadrant, bored it out, made a spacer and sourced a screw. It fits the 1951
Gillott frame's Simplex brazeon and works a treat - looks very neat too.
Pics on flickr here.
Took about 3 hours of head scratching, measuring, drawing and machining.
Mark Stevens Evanton Scotland