The mystery of March 17th has been solved! Last week's mystery tool is a Roper Whitney hand seamer used for crimping and seaming copper roofing sheets. The relative malleability of copper explains the lackluster clamping strength.Thanks Sam and Jeff! Well done!
Roper Hand Seamer - Link
Interesting site about construction of copper roofs - Link
Includes detail on a particularly sinister looking self-propelled seamer that makes my comparatively puny hand held version look like an instrument better suited for a tea party.
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