This is a simple jig I made for hand-mitring. You set the angle you want by lying one arm flat on the table and using a digital angle finder box. Then you tighten that nut (the bolt is welded on the other side). Then you can put your two tubes into it, holding them flat inside the bits of angle iron, and see how well they fit up. It works pretty well and is easier than trying to peer at things in the jig because you can hold it all up to the light and move it all round.


Jig for hand-mitring