Well, to answer Primus question (does your name have to do anythig with this guy by the way?
http://en.wikipedia.org/wiki/Primus_(Transformers)

)I use both hans-on method as Bonnie and Bill descride. Arms over the head, place the klicky in a sitting position with the piece of cardboard between legs and torso, hit the klicky on the floor but on its heels...
As for the pliers, be sure to make the pliers as less sharp as possible, place it right above the neck, make sure it has good catch on the base of the head, but withoud squeezing, and pull, again without squeezing... it might take some time, you might hurt a klicky and most definately watchout not to hurt yourself, and make sure you pull sideways... to tell the truth, my elbow joint hurts from all this pulling....
The rubber band method has never worked for me...
Bill, thank you for your nice comments... I hope one day I'll be able to make a good steck castle/medieval town!