Your idea to hire a rigger is sensible. He will be able to determine if there is a problem and probably can do the fix without unstepping the mast. We drop our mast every three years and I do a complete inspection--including removing the mast cap and inspecting the sheaves. When the OE sheaves are polycarbonate, they could be degraded and need replacement. Also, you might have an issue with a tangled halyard
inside the mast which is restricting free movement. This can more easily be done when the mast is down and you can check it properly. Also, you have not mentioned if you raise the main from the mast or from the cockpit
. Even though our halyards are led aft to the cockpit
, we raise the main from the mast when conditions are not too lumpy and it makes raising a full battened main easier in my opinion. In any event, maintenance
are an important part of boat ownership
. Good luck and safe sailing.