Sorry for the anemic initial post. Sent this out from work without much to go on. And now, the rest of the story...
I am making a clamping fitting from a carbon fiber rectangular tube that will grip and slide on a 20mm CF tube.
It is part of an adjustable butt fitting for the Izhmash 7-2 build.
Already tried it by filling the void with a resin / CF chop amalgam.
This grips well when clamped down using a cam lever, but doesn’t slide easily when loosened.
Next thought was to fill the void with Marine Tex around a thin brass 20mm ID tube.
Sanded/scored the exterior by spinning the brass tube on a mandrel against 40grit to give a rough surface without burning through the 0.35mm wall.
Also scored the interior CF oval tube with 80grit to give a fresh rough surface.
As mentioned above, neither the Marine Tex, West resin or super glue would bond the brass to the Marine Tex.
JB weld seems to be holding the brass sleeve for now and hopefully it will cure harder over the next few days.
It seems a bit soft after 14hrs so time will tell.
Here are the two components I am trying to fill and bond.
I will continue to try other combinations of filler and liner material to get a good grip when tight and a smooth slide when loosened.
Your recommendations would be greatly appreciated.