I found an old konus tripod but the quick release plate was missing. So I designed and 3d printed one. 

The measures are not perfect but it fits well and it's very stable.

3d printing the camera screw mount is not recommended since it could break into the camera, I just took one from an old flash holder. If you are going to buy one prefer one with a folding design which allows easier tightening and fits in the internal plate space.