I need some help finding a replacement nipple for my western arms/uberti rifle it is a Hawken style rifle on the left side of the barrel it reads "A Uberti & C Gardone V.T. Italy" on top of the barrel it reads " Western Arms Corp Santa Fe N.M." under that it reads "Jedediah Smith 1799-1831" I do not have a thread pitch guage and do not know if it is standard or metric. Any help would be appreciated.