Arca Swiss type tripod adapter

I have modified my previous version (2) of the adapter. This one has a little tighter tolerances. It uses a 1/4-20 three-prong t-nut to mount the adapter, allowing the threads to be closer to the bottom of the base, for those tripods with a short mounting screw. The t-nut also provides for more threads of the 6-32 screw into the plastic of the base. The base has recesses for those plates that have stop-screws. The knob size is better. I have included a camera quick release plate with this design. I found that some of the plate designs didn't fit my standard Arca Swiss type adapters, so I decided to add one here.
As with the first version, I wanted the adapter to fit my existing plates and I wanted a single knob to tighten or release the clamping mechanism. I considered using springs to spread the jaws, but wanted to reduce the parts, so I flared the end of the knob to fit a dovetail-like slot in the sliding part of the jaw. The knob has a hex recess into which is pressed a 6-32