begs the question - what are the two tabs hooked up to on that switch?
if they are connected to another tab, then you just have connection options. If (and i suspect this is the case for those big old open frame switchcrafts) that the two poles are separate and these are additional tabs for either side of the poles, then you'll have to do some reverse engineering on the switch to come up with your schematic. In any case, you'll likely need to connect the 'out' side of the poles together.