I was playing around with the floating tables this morning during my first cup of coffee. As I was hunting around for the allen wrench to tighten a support leg bracket onto the floating table tube, it occurred to me... why not use studded knobs instead of allen set screws?
The stud on the knobs on the undersides of the floating tables are too small. However, the black-handled knob on the quick-clamp miter assembly works perfectly! These knobs are 514310 and are currently on sale for $1.72. Click here to be taken to the maintenance parts breakdown for the miter gauge.
If I had to guess, I'd say the threading is 5/16-18.
The miter knob is a bit big for this task. What I'd really like is a smaller round knob more like this, although I have no idea if the threading is right, and the threaded stud is much too long for this purpose anyway.
I may have to keep an eye out at the local hardware store for something that would work nicely here! Or, maybe Shopsmith can come out with their official support leg knob.

Time for a second cup of coffee...
- Chris