I have the MPPMKV11 with a spring back(no graflock bars). Can I use a Graflex ty pe 6x9 holder under the groundglass(with a felt pad to protect it) ?, is there e nough gape to take this type of holder ?, or do I need the slip-in calumet type ? Also could I use a Calumet groundglass, and would the format markings work ?. Cheers, Lee.
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