Good afternoon, I thought I'd share this as it has made a notable difference to my car - More torque and smoother delivery throughout the revs. If, after a few months of use, it proves to be a reliable design/distributor I'll put the drawings on the forum - Albeit I forgot to get them back from the machine shop.....I'll rescue them this week.
I bought a 123 distributor because I felt there was little point refurbishing my Lucas dizzy if I had to combine it with poor quality reproduction caps and rotor arms. I have tried both Sprint and Ambassador caps but they were so badly manufactured the rotor struck the inside of the cap.
The adaptor is machined from Stainless Steel and bolts to the threaded holes in the engine block. It is combined with a standard clamp to hold the dizzy in place. The drive gear needs a bush to mount it to the shaft and also grinding to set the shaft end-float. The wires need tidying but it fits well. The design allows the adaptor to be removed from the dizzy and it has plenty of rotational adjustment, however the compromise is that it relies on the clamp to hold the distributor against the vertical force created by the drive gear. I'll keep an eye on it for movement.
I have done about 50 miles with it in (many of them at full throttle...) and so far so good, but like any 'Heath Robinson' invention I'm dreading a loud and very expensive bang! I'll remove it after 100+ miles and update this post.