Mike, with stainless heads like the Steelforce, I think a pocket diamond hone is best. Just follow the original edge bevel on the main blades, just like sharpening a pocketknife. Bleeders can often be touched up with that same hone, but not always. They are meant to be expendable anyway.

Of course you know that Steelforce will sharpen the heads for you if you mail them back with a service fee.