Had no idea, but makes sense to put on a metal cover to repair a cracked shankI say you can take the stem out when done. But if it is offering more resistance then normal then wait. If the resistance is not noticeably different then normal good to go. The military mount from my understanding was more a repair job using shells (not sea by the way) to fix broken shanks as on ole jury rigging. It just happened to have some great advantages.