I know Frank Badalson used to advertise that he restored them, but a friend of mine completely restored his cast iron dual point unit and said it wasn't hard and I'll have him look over my shoulder when I do my cast iron dual point...but I recurved my MP electronic distributor 20 years ago and then did my friends, wasn't hard, just need a large, clean work area for all the small parts. I think mopar muscle had a step by step breakdown on a how too a few years ago. Another friend of mine did the Pertronix conversion to his GS Stage 1 distributor - no problem