Pretty cool, but I don’t think a cradle that has to be locked in a vise or is limited to working height would be something I’d want to use. I move around the work when I checker so having the cradle attached to a ball socket that can be locked or adjusted with ease works better. A cradle that is adjustable for different working heights is super nice too.
A ball and socket like the Wilton Power arm comes to mind, that’s how my cradle is set up anyways.
Not a critique, just a suggestion or an idea for you as you fine tune your cradle.
Dustin