Coming soon - recurve apertures you can build

I've been testing/prototyping a recurve aperture which I plan to make available to anyone who wants to put one together.  I'm not going to be selling these things, but rather I'll make the model available for order from a 3D printing company, and then you'd acquire a bolt, a nut, o-rings, and glass if desired.  So far I'm thinking two sizes would be good: one that accepts a 15mm glass window (about 5/8" O.D.) and one that accepts a 12.5mm glass window (around 1/2" O.D.)  Naturally, you'd only use the glass if you want to use a dot or drill it for a fiber.  Otherwise you would be able to just use o-rings to vary the size of the aperture opening you look through.

Here's a rendering:

Stay tuned ... should be ready soon!