This rifling guide is attributed the gunsmiths Jonathan Dormayer and Charles Monroe Knupp and is now a museum piece. Charles Monroe Knupp is believed to have been one of the last apprentices of Jonathan Dormayer, was 22-years-old when Jonathan Dormayer died, and is known to have attended the vendue sale of Jonathan Dunmeyer's possessions. It makes perfect sense that Charles Monroe Knupp would have his uncle Jonathan Dormayer's rifling guide.
This rifling guide is also attributed to Daniel Border, but there may be a reason to wonder about that attribution. In his booklet "The Bedford County Rifle and Its Makers" Calvin Hetrick reports that he visited Dolphus Drake at his gun shop when Dolphus was 93-years-old. Calvin wrote that during the visit, Dolphus showed him his rifling guide, and told him it had been made and used by Daniel Border and had been purchased and used by David Defibaugh. The booklet says the purchase by David Defibaugh was after Daniel Border died, but I wonder if the purchase occurred after Daniel Border transitioned from gunsmithing to horology and jewelry. That transition began in 1855. It is also possible that either Dolphus or Calvin was misremembering a conversation, because David Defibaugh took over and was working in the former shop of John Border a little over a month after John Border was killed in a railroad accident. That circumstance makes it seem possible that David Defibaugh might have acquired John Border's rifling guide.
With this rifling guide, the cutter guidance is provided by a rifle barrel that is mounted in a way that allows it to be rotated to move the cutter to the angular location of the next groove to be cut. The indexing wheel provides for cutting six or seven groove barrels. The pull handle for the assembly is missing, as are the screws that clamp the barrel in place.
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