I had first used this design prior to finding the tripod mount at the store.
so i thought i would share it with you guys still. (in case you cant find a tripod top)
I got some aluminum shim stock from wk (aerospace company)
Then, at the hardware store i bought a 1/4 x 20 x 1.5 inch length wing screw. The pic shows a 3/4 inch length one, but i didn't end up using it because it was obviously too short.
also, you can see one shim has a 1/4 hole and the other has a 5/16 hole. you need to do this if you plan on using the shim stock. needs room for the bolt to bend to the angle of the shim. get it?
I added a diagram to show how i installed the wing screw and order of parts.
I used a tight fitting rubber washer/grommet or even a nut in the INSIDE of the square so that when you remove the camera the wing nut doesn't go falling to the floor of the Z.
-j