Has anyone got the relevant drawings for making the Duplex (or Potts) drill grinding Jig?
There were a series of articles in the Model Engineer in 1952 (issues 2632, 2634, 2638, 2640, 2642 & 2644. There were further articles in 1963 & 1964.
I also believe that Woking Precision sold plans but Woking no longer exist.
Hemingway do a kit of castings and bar material with drawings but don't sell just the drawings.
Cheers.
Phil