All; FWIW; My process is to put the finished mitered tube back in the jig, and clamp it with the tube blocks, and then put a small Mag-lite in the other open end of the tube. I keep the mag-lite on a hook right next to the on/off switch for the lights which I designed in as one of the 4-way switches for the shop and located it on the column right next to the build table. The less light sneaking out at the joint, visible in the now darkened room, the better. If it looks good (just a "UFO glow", I turn the room lights back or and move to mitering the next joint. I want all the joints to be very well mitered and inspected before adding the lugs to the equation; if I am using lugs for that build. /k