Hi Bill, What do you get for your money with those things? Is it just the 4 small aluminum brackets shown.
Yup. That's all you get. Just four brackets and some hardware. That's why I said "or similar". I will probably use thick aluminum bars with spacers to duplicate their function. I am envisioning each of the four bars going a little below the track with adjustable setscrews bearing against the fence metal for additional strength and final truing.
Also looks like they have, or are designed to be used with their Pro-fence.
Probably any fence with a T track on the back side.
I use a rule of thumb of 25-30% of the length of board I'm likely to run through on the vertical.
Ah...THAT's what I was hoping for, a percentage rule of thumb. I was thinking it, but it never got to the keyboard for me to ask. Since the regular fence is 4 inches or so high, I am considering making the riser quite a bit higher, but don't have enough big-table experience to choose wisely.
Does 50% of the highest board sound like too much? Just guessing here.