Gentlemen -- thanks for all your input. I have to confess a stupid error regarding the film holders. I had measured my film holders with a sheet of film loaded when I was measuring for comparison with the GG. For checking tolerances of the holder itself, it should have been empty, of course (duh!) The sheet of film measures roughly .010". So, nothing wrong with the film holders (Fidelity Elites) or the measurements, just my momentary absentmindedness. Sorry for the confusion.
Regarding the Fresnel lens. Unfortunately, this one is pretty scratched up. I thought I would much rather see the image on a nice clean ground glass. Shimming out the new GG to exactly match the position of the film plane looks to be a 'no-brainer'.
A Fresnel screen would seem to complicate things, given it has a theoretical focal length and characteristics of it's own. Not everybody uses one. I've read differing opinions on it's placement, effectiveness, etc etc.
Anyway, the additional Graflex info has persuaded me to at least give the old Fresnel screen another try when the new Satin Snow GG arrives. At least I'll have a flat GG! I'll see where I go from there.
Thanks again everyone.
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