I got this 2nd stage off eBay and thinking that it was R109 but it turned out to be a 156 BA. I never had a 156 before so Im not familiar with how it should look so I took some pictures to share with fellow members and to hear your advice. Is this poppet ok to re-use or can I change the soft seat out? The soft seat looks pretty worn to me. Also, can the metal stem of the poppet where the small O-ring is sitting be taken off from the plastic body, pic #3? Just curious.