I don't like skull crusshers, so do a version overhead. With ez bar or straight bar, I lift bar overhead and then reverse bar behind neck as far as I can go and then return overhead.
Only problem is tendency to move shoulders out rather than keep elbows in (as with skull crushers), but still find it best for triceps along with close grip bench and pushdowns for something easier.
silverback, do you try and keep elbows in?
I find it a bit uncomfortable, so let them go out a bit.
No, my focus is getting the arms as far back as possible and try to touch my back with my hands, in this case i don't believe the position of the elbow is important in this exercise, but trying to get a "pre-stretch" of the tricep is.