Freehub replacement Alex 320 wheelset

Hello,

I have a set of Alex 320 wheels on my bianchi axis. I'd like to replace
the freehub, it's creaking. The axle doesn't seem to have the typical
set of cones and nuts I'm used to. It looks as though the cone has a
set screw in the side of it, and no flats for a wrench. Is anyone
familiar with this axle arrangement, is it as easy as back off the set
screw and unscrew the cone?

thanks

Frank