Not sure where to post this but any help or advice on even where to go to get info appreciated. I have been collecting Starr X openers for a while. I ran across this one at a flea market and it was a blank Starr X opener made for a few years mid 20s. It has this brass extension on it that I have never seen. I can not find out anything about it in my Starr X book so I don't know if it was made for a specific pourpose such as a motel or some special use or if it was some kind of factory made add on. Thanks.