Making a CFC? If you want to make threading the copper into the hose easier you can flatten the end of your copper tube that you have made straight and make the end so it will pass throught the tube. Drill a hole in the end of the copper and attach a strong line (long enough to pass through the length of the hose) to the hole and secure it. Attach a vacuum to one end of the hose and suck the line through. Now you can pull the lubricated copper tube through a little easier.