You have absolutely no idea. If I can build it, I will!
I tore out the inner plastic mold release liner and scuffed the inside of the shaft with some 60gr sandpaper so the epoxy would have something to bond to.
A doubled-up piece of camping pad foam. I really only needed it to press the CF against the inside of the shaft.
I also pushed plugs of the same ethafoam into the shaft so the epoxy wouldn't run away from the CF before curing.
I cut the foam to the inside dimensions of the shaft. One piece was too thin, so I hot glued two pieces (1/2 x 1.25" x 4" long) together to get it thick enough. Wrapped that with the dry CF and then wrapped the cf with some cheapo sewing thread to compress it smaller than the hole in the shafts. I then saturated the CF and brushed some more inside the shaft and stuffed the plug in. Once it was in both halves, I snipped the thread, which unraveled and let the foam press the CF against the shaft. I clamped it straight and let it cure overnight.
The outside was easier--ground into an hourglass shape so the CF was tapered and epoxy/taped it as described above. Sanded smooth and another topcoat of epoxy.
I have absolutely no idea. I scrounged some scraps from the composite materials lab at my university 18 years ago.
REALLY heavy triaxial (0/45/-45) with the 0 parallel to the shaft.
US Composites 635 thin epoxy with medium hardener--leftover from some boatbuilding projects.
http://www.uscomposites.com/epoxy.html
This probably deserves its own thread!