I will be using a 1 1/2" carbon fiber tube for the wing. I like to make my own sockets because they fit the tube better. I must say the tube for this plane that was purchased from T-N-T Landing Gear measures very close to 1.500". On my last build the tube measured 1.490".

To start I coat the tube with Vasoline, poor man's release agent. Next a piece of wax paper cut slightly longer than the perimeter is wrapped around the tube. The wax paper is wound around the pressed into the Vasoline as I go. Once it makes contact the paper becomes black the color of the tube. Just work slowly rubbing until contact is achieved.