Nice to see things moving forward. Hopefully someone with access to various dials (we're talking 1665's and 1680's and vintage Explorers here), accurate measuring equipment and the appropriate skills can do a comparison of dimensions so we can settle on the best (ie the most useful) sized wheel to produce. So, come on chaps, get those digital calipers out and get measurin'. I would tentatively like to suggest that we compile as much info as poss so that a consensus can be found (fingers firmly crossed on that one!).
So, should we concentrate on getting accurate measurements for Ingod44 dials, MBW dials (both old and new), Yuki's and NDT's? I'm guessing that these are the ones that we as a collective regard as the most popular. With a bit of luck we might find that an accurately produced wheel for an Ingod44 might cross over and also be useable by a person who has an MBW dial - again, fingers crossed.
I'm thinking out loud here so please chime in with observations/comments if I'm overlooking something.