I have a few of them and they do work well, without lube. The only thing I do is clean the inside of the case necks with a brush.

I have them in all my older Redding and RCBS dies. The latter carbide replacement you can get from Hornady. I don't use lube with them. I've more or less gotten away from the expander style and have moved to the bushing dies where you don't have to use lube, and you maintain concentricity much easier. You run the risk with any type of expander of getting an eccentric neck, especially if the die over sizes the neck and the expander has to push it out a long way.

Has anyone carbide free floating expander buttons that can be purchased for redding expander/decapper stems. Do they work, can you expand the cases without using case neck lubricant? Do they keep case necks stright and concentric? Any experience or information that you have would be appreciated.
thanks, cflier