door lock cylinder replacement?

[DirtyDeeds]

ok has any one replaced your door lock cylinders? I'm trying to do mine and it looks like its just a black flat metal clip thing and maybe a c clip holding it in, but its so tight i can't figure out how to get the bastards off!! any tips?

[Dzimm]

Use vise-grips to clamp the tab and tap the vise grips with a hammer if need be. PB-Blaster will help break up any rust holding them on. Also wiggle the clip up and down as you pull it back helps.