I just make sure when I start a 1/4 inch tubing in a hole drilled with a 'F' drill that i just start the tubing in the hole and apply epoxy all the way around the tube. This to me insures that it has contact all the way through the hole.
My grand son an Oklahoma City policeman started doing some leather work as a relief. I liked one of his scrolls and told him I would give him a body and let him do HIS magic. Looks good to me!
I started with a foreign 4 by 6 after 19 years the gear box went. I got a Fox on sale and love it. 1/4 inch 8 by 12 table made for it. I have had this one 16 years and still going strong.