mirror cell pivots

I'm going to make a 6 point mirror cell. If it works out, I'm planning an 18 point. What's the best way to pivot the centre of the support bars? Do you just put them together with a small spacer underneath and leave the screw loose? Any photos out there?

thanks,
dan

Dan,

I use stainless steel nylon insert lock nuts. You can adjust them to where ever you need to and they stay put. They have a rounded top for the bar to "teeter" on. This has worked well for me.