I would add to the other comments that it is VERY easy to do serious damage to the revolver by shearing off the locator pins or bending the center pins. An amateurish solution is to use empty cartridges in the charge holes when loosening or tightening the parts. The real solution is to get the special tool from Brownells which makes extractor and center pin removal an easy job. Remember - with guns, it is all about having the correct tool for the job.
http://smith-wessonforum.com/s-w-rev...actor-rod.html
fwiw