Hi.
I started with a Fotoman 80mm helical, a 4X5 Horseman ground glass, and a Hugo Meyer coated 80mm f/6.8 (4E/4G).
Prototyping : I chose maximum difficulty with the shape, a truncated pyramid. All main parts in 3mm thick H111 aluminium and thin parts in 2024T3 0,5mm thick.
Let's begin with the easiest part, helical front plate and M2 threads
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