Ah, you are missing the point. The crossbar is the fulcrum.

You step on the crossbar to drive the tines into the ground, then grab the handles and lean back. The crossbar on the surface of the soil is the fulcrum, and you just swing your weight back. Works very well.

Yeah, they're fun to use. Just make *sure* when using your broadfork in rocky soil, that you don't lean back into a *big* rock. The tines are quite solid, but you have tremendous leverage with a broadfork, and straightening those tines after you bend one on a big rock is not fun.