Hex Screw Clamp with Gear output

I've seen these motors on sciplus for years now, and just recently saw them on amazon. Since their popularity means other people might be using them, here is a model that makes mine much more useful. Included is a picture of the kind of motor I designed this for.
Instead of using the outer edges of the threads as a shaft, or paying almost a thousand dollars for a tap set for 7/16 ACME threads, clamp these to either side of the screw shaft and drive something with 40mm hex.
Needs 6 m4 nuts