Yes, I see the similarity in the brake/clutch lever, but it's made of COPPER and usually there's more of the ball away from the driver on those. Here's a link to a possibly more complete version of what's shown here, although it never really got resolved; http://www.treasurenet.com/forums/what/148478-possible-french-spanish-crossbow-piece.html
I do agree with a lever of some sort, but tend toward it being something that had to be alternately pulled and pushed (rather than just pulled), based on the juxtaposition of the ball portion to the shaft portion.