I've created an 3d printable Ground glass holder for the Lomograflok back, enabling you to remove ground glass and offset mask in unison after composing, speeding up the process, reducing the risk of dropped viewscreens, and enabling the use of factory accessories such as folding hoods or reflex viewers.
The thickness of the offset is varied by sandwiching washers between ist two halves (currently using a 21,8mm offset over the factory default 19,5mm for accurate focus). The included attachment clamps for the Chamonix viewscreen are separate pieces attached using screws, so you can easily create your own to adapt it to your own viewscreen.
Thingiverse Link
Dimensions in mm, if you want to check compatibility or use it as a base for your own design:
Lower Frame
Upper Frame
Attachment Clamp for Chamonix Viewscreen
Assembled (@ 21,8mm offset)
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