Great idea mate!!! after dealing with many "near miss" or bloody hands i made my boss buy "Kopel" clamps $1500au pair! same as yours but they use a cast ally block and a worm gear to screw the clamp down they work great really quick but way expensive. yours is also adjustible for lenght so even better. at a cost we all can have. (something to think of- if you use a cap screw and cut a stot in the side of your tube so a ball end allen key can get in when you use the clamp on a tee slot table you can fix it down or have it loose if you need to move it round. realy easy to use may need to use a thicker wall though |