Some scroll work requires you to tilt the table. I accomplish this by allowing the table to pivot on the tower end and created a trundle on the opposite end. The thing to remember is the top of the table is 5” off the base. With the table width at 12” I created a curve so that the radius is 4 1/2” . The trundle is 2” wide 1/2” ply with a 3/4” slot in the middle. The slot can be smaller it just needs to be able to pass the lag bolt through it.
The support is a 2 1/2” board glued and screwed in through the base about 2 ” from the front of the base. I think it would be better to shorten the support to 2”.Again to allow the lower arm maximum space.
I believe I attached the trundle and tower end to the table first, then figured out where my support needed to be. The trundle is 9” in from the front of the table. Once you have that you can clamp the trundle onto the support and mark where the copper covered dowel supports need to be attached. I used 3/4 copper tubing. Once those are glued in and the table is resting on them, I then drilled the center bolt through the trundle slot. The bottom line is to make the table sit on the copper and be 5” off the table. The table should be flat.