Basic handle with inset to fit a 7/16 nut

Made this handle to fit the waste valve (Valterra type) of my RV. The valve has a 1/4" UNC threaded shaft that slides in and out to operate.
This handle is secured onto the thread using a captivated nut on one side and an identical locking nut on the other.
It could be made to fit a 6mm shaft and 10mm nut easily.