Well I guess this would be shoe V3.
It brings two improvements:
(1) Increased airflow, doesn’t have a choke point. So the hose doesn’t recoil as soon as I turn the vac on.
(2) Slot at front allows easy removal and replacement with bit in place. The other unit required maneuvering around the bit. Not that you need to remove it very often, but this is just better.
Still room for improvement:
Different hardware (not available locally) will allow me to maximize Z capacity. I’ll replace the standard nuts with (I think they’re called) barrel nuts. Note that I haven’t had a problem w/ Z capacity, and as pictured I have a 1/2" board on top of my spoil board, and another 1/2" board on top of that (for holding the .1" polycarbonate with my binder clip board). But still why not optimize.
