"""""""""""Is this what you're talking about Burr?""""""""""""""

That Danny has a mind like a Steele Trap. Thats the thread I was refering to where it had been discussed before.

And then the flip, I'm not sure how/if that works...I understand it's about applying a curvature from the existing surfaces, but then to be able to flip/invert that could be some type of cavity tool. But, maybe thats just me looking for "wacky tools?"

But basically sliding the apex of the buldge around could be useful.