I can’t get the O-ring flange to fit into the 2" aluminum enclosure tube. Are the tolerances too tight or is my technique wrong? The videos make it look much easier than my experience!
After using silicone and gradually increasing pressure (and even trying to apply a vacuum), I finally gave up and used two threaded clamps to force them together. I was able to get one O-ring in the tube, but sheared it in half in the process.
Any suggestions or ideas on technique?