How do you take apart the bolt on mod.66 B Stevens rifle?

Bolt head is attached to bolt body by a cross pin. Pin is driven out from LEFT to RIGHT using proper sized pin punch. If you do not have the proper tools, take this to a gunsmith- most of those parts are no longer available, break them, and you will not find another. If you only want to clean the rifle, use a spray gun cleaner like Borescrubber. Wear safety glasses while using the spray.