I can't tell what's going on here. I want to switch out axles to something shorter, so I can use a QR. But I can't figure out how to get the axle out of the hub. As far as I can tell, it's threaded onto the two nuts in the picture, and then the inner-most metal ring on the hub (is that the cone?) - that is, all of those spin with the axle. There seem to be no markings on the hub to indicate make or model. There's nothing that looks like a dustcap that can be pried off. I don't know what to make of it...

(I'm a newbie, so I may be missing something VERY obvious...)