Need Dimensions for Cover Plate Clark Johnson Reproducer

[phonorad]

I am looking for some assistance so I can get a cover plate made for a reproduction Clark Johnson reproducer. I have the metal parts for the reproducer except the cover plate, and was wondering if someone who has one could tell me the basic dimensions, namely the overall diameter, thickness, inner hole diameter, thread size for the small screws that hold the block covering the stylus bar, hole diameter of the 3 mounting screws, etc. I can determine the mounting screw hole placement using the parts I have. Any or all of these dimensions would be appreciate, or perhaps a 1:1 scan of a cover.

Also, if anyone knows the 'font' and size used for the serial number, that would be of interest, as well as what diaphragm size and gasket material/size/thickness is used (I assume 2 gaskets, one on either side of the diaphragm).

Thanks for whatever help anyone can provide!

Mike