if you want to save the skin on the hide to dry or the tail for lures.
once you get the squirrel skined down to the tail,put a large nail on each side at the base,grip the nails in your hand and the tail between your fingers,let the nails slide down the tail fron base to tip.the bone will slip right out of the skin.

if that is not what you are talking about,are you wanting to keep the meat from pulling off the hams????

or are you skinning the squirrel by the tail???

I am not a hunter I am a whitetail population reduction specialest

remember keep your back to the sun, your knife sharp, and your powder dry.