I went to put on the mainsail on my CS27, all the halyards exit the top of the mast towards the bow except for the topping lift. Is this normal? One of the halyards is a cable, I assume this is the one for the main.
When your boat was built it was common to use "wire to rope" halyards, the part that attaches to the sail was wire and the end coming out of the mast was rope. The main halyard should exit the back of the masthead.