I am shooting the Copper John Dead Nuts,and yes the pins are normally stiff to move up and down individually.Oviously very tight tolerances.
What bigbuck said works very well,just dont put alot of pressure on the end of the pin.
Best thing to do is site your 20 yard pin(or whatever range your 1st pin is set for)by moving the whole site ring itself.Then move the remaining pins individually.