The 4"x 2" Aluminum Rectangular Tube Arrived

I should have considered this in advance " my mill vise is 3.8" wide at maximum opening. If i had a 4"+ long endmill I could just put the 4" side vertical and side mill it from the roughly 0.8" slice to 0.62". Endmills that long are expensive! (I should have ordered 3.5" x 2". This would have fit better to the ring anyway.)

This is not a Kurt vise or a Kurt clone so the jaws are not reversible.

Trying to use hold downs to lock the workpiece to the mill table did not work. You need something under the workpiece to sacrifice when the endmill reaches the bottom. I foolishly tried to use Delrin for this. Aluminum on Delrin is very slippery and you cannot tighten these hold downs down enough to hold them.

Supergrok suggested gluing the workpiece on something that will fit in the vise. I found a 3" piece of aluminum and Gorilla Glued the workpiece to it. Tomorrow it should be solid enough to try and mill it.