Excellent Warren..
Although I am sure that the crowns will NOT fit without modifications from The Zigmeister or someone else.. I tried to fit it and I couldn't. The case tube is too small on the reps (and too big on Jimmys) so something must be done about this issue. Plus the Manual 6497 will need a stem adapter from 1,9 to 2,1mm.. Don't know how much it costs and how easy is to get them.
Anyways I will leave the technical part to master The Zigmeister's post after this weekend.
Again you must make clear to people and they must understand that it will not be a simple swap and they will have to send their watch to someone if they cannot do it themselves. Nothing wrong about this (I did it) but it is an extra cost they have to consider
Busy days for the mod guys i forsee...