By definition, cordwainers make shoes from this material
[DOC] [TLE] Footwear of the Middle Ages - Glossary of Footwear Terminology, C [PAR] It is likely that this is the knife used to trim the inseam while the shoe is still on the 
last, ... "Channeling the sole, making a riggett in the outersole for the wax thread 
to be lain" [Holme, 1688].