Welcome to the party lol, we went through (broke/destroyed) every single one we purchased. They were all crap. The best we found were at west marine, even though they too broke in quick order, but at least would extract a couple rings of packing before letting go.
My brother and I were talking about that project last week. Of all the things I've done to the boat pulling the ancient, rock hard, rudder stuffing was by far one of the worst. Every knuckle I had was bleeding/bruised and hands ached for days afterwards. And yes, we wore gloves.
If you are doing it on the hard I'd highly suggest just dropping the rudder shaft, it will make your life WAAAAYYY easier. Of course we did it in the water so that was not an option.
What a bastard of a project.