[Bruce Lancaster]

And start tooling for that blasted lower cap!
I have bits and pieces from some of those stock Ford (59) cap dual coil conversions...these are interesting because they made the conversion with no need for any extra plastic or much more technology than a drill press...they simply added a contact to the back end of the stock rotor and screwed in a brass ring around the center of the cap! I think they used same type plate conversion as HC, though there are no labels on the partial distributors I have to prove anything.
If someone simply made brass rings and tabs, and accurately drilled some points plates, that would be a cheap and easy conversion replicating an actual traditional part. It would make sense to do it with some compact common points, too, like '60's Mopar or '50's Ford. It seems silly to chase down weird old magneto points from antique cement mixers and aircraft for a simple conversion on a fairly low RPM battery ignition.