Not sure what your project is? but I use Carbon Tube and Aluminium inserts for Race Car Wishbones. You don't wan't the fit between the tube and bush/housing too tight, quite loose actually. If there is not sufficient clearance between the two components then the adhesive will be "pushed" out when they are assembled giving a weak joint. I use 0.5mm clearance. If you can machine small grooves on the inside of the ally part, this improves the mechanical "bond" massively.