Wood US idea

Well Ive lost track - anyway, I think this is the second mystery tool...

I picked this up in the tool section at a local thrift store. It was in a box labeled "plane parts". It does appear to have the adjustment wheel from a Stanley block plane as one of its parts, but I really dont see how this could be related to planes function wise.

Take a look:




My first reaction was a homemade version of those screen door tools, but those are so cheap Im not sure why anyone would take the time to make one. Unless, they were in a remote location maybe...

Oh, I forgot to say its about 5 inches long.

Any thoughts?