HTC Vive base station tripod adapter(fixed ver. of lluisgl7)

The adapter between 1/4'' standard camera mount and HTC VIVE ball mount for lighthouse. The original adapter has been a incredible job, but as far as I try, I cannot put a standard 1/4'' nut in the center pocket, because the original design had only 10.5mm hole. (standard 1/4'' nuts have size of 11.1mm)

I could not find the proper nuts that maybe is used by original author. So I modified the original design little bit so that we can fit standard nuts can fit.

On the pictures, black one is