The 60 watt laser that I am using is quite long and for obvious reasons quite fragile, so I decided to make up some saddles using some 1/2" plastic...looks like delrin but not sure. I used some green felt lining material to provide a bit of cushion between the tube and the support. At least I know know that when I move the assembly the tube won't shift and I won't be needing to do any realignment. Probably overkill again, but what the heck...it looks cool
In one of the pictures below you see the tube mounted on a test bed...well that test bed became a module that holds the tube.
Richard