This little gem has been sitting in my clamp milk crate for a couple of years and I doubt I have ever used it. I always pictured binding miniature books. The quickest of Googling reveals all...
March 3rd Mystery Tool Link - Still Unknown
About Mystery Tool Monday
Each Monday, D+R will present a new mystery tool for identification. It may be from our collection or may be an item that has puzzled a D+R reader but, whatever the case, discovering its mysterious use will be as thrilling as a Mickey Spillane dimestore paperback.
Previous Mystery Tools Link