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The Pro Lens is surface-mounted on the light box. The flange is drilled and tapped in 3 places (120% apart) for an M4 machine screw. Thus, the barrel of the lens would not protrude into the back of the light box as shown.
Thanks for the tip buckyball. I will update the model to reflect that. It would be really helpful if someone could give me more exact dimensions of the pro lens; I just had to guess really.
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nice work

, however I noticed your lamp / reflector is not centered.
Thanks moose. I know that the lamp isn't centered in one of the dimensions, I left room for a mogul base but I was too lazy to model that part.
Let me know what you guys think of the executable 3D model.