Hello! I am in the process of designing and 3D printing a 4x5 camera, and I am now trying to figure out how to connect the ground glass frame to the rear standard. I have seen online different ways to do it: elastic bands, leaf springs and torsion springs. My favorite way which seems the most convenient is the way that the Chamonix cameras use: a pair of torsion springs. However, looking around internet, I am overwhelmed with the amount of choice. I have no idea what coil diameter, number of coils, etc, I should use for this project. I am also confused because I believe I should use a torsion spring angle greater than 180 degrees (like 225 or 270 degrees), but when I check European suppliers (such as Misumi) I only find springs up to 180 degrees (this made me think that maybe there is equivalence between different angles, but I am unsure about this). Do you have any idea of what type of torsion springs Chamonix uses in their cameras? Thanks!
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