
It works.
I just smack that bent steel strap bolted on where the sprue plate cam used to be with a plastic tent stake hammer. I actually think it's an improvement over changing my grip and grabbing a third handle to pry the sprue loose. This way, I just grab the hammer and smack it. Then I swing the sprue plate back into position with the hammer head and I'm ready for the next pour.
I'm not sure Lee's design team had their heads on straight when they decided to make that sprue plate cam piece out of cast metal. It probably would have been much better to use forged steel for that little part.