I've tried a couple of orientations using clamps and offcuts, at right angles they didn't give as much stiffness as I'd hoped and also impede leg room. So I'm hoping the angled stretchers going from legs to table top eliminate that. I guess I'll find out...!is the stretcher going to add much stability to the table. thinking of the table being bumped into from the side or end, I would have thought that 2 braces at right angles would have been stronger.
I reckon you could achieve the same grip by drilling a hole though the bar, couldn't you? That might be easier for most people rather than trying to cut a thread.I expect that these stretchers will be in tension and therefore you're looking to maximise 'pull-out resistance' - on that basis, I'd try and cut a thread in the metal at each end (same idea as why steel rebar is not smooth but 'bobbly') and widen the bottom of each hole (so it's sort of conical) and try with epoxy.