I bought a whole 1/4 drive deep socket set at Harbor Freight for the price I would have paid for a nipple wrench online or from Calelas. All I needed was that one socket.
A few minutes with a dremel tool and I have a solid long lasting nipple wrench.
I just made one for experimenting and for pietta the 3/16ths socket was a perfect fit. Its the only extra i had sitting around that i found outside on a parking lot. What luck that it would be the same size ouside width as the pietta nipple collar. Thanks for the idea mike!