I have been scratching around in this forum for a while but cannot seem to come across a similar problem. The end nut on my pump rod is stuck (Primus 111B). The pump rod seems to be made of steel and the nut also appears to be of same material. I need to take this off in order to change the pump leather washer. Can anyone help with technique, ideas for getting the stubborn nut to come loose, etc? I'm scared of the thread breaking off the pump rod. BTW, fantastic forum! Its great to see so much knowledge being shared by like-minded people.