I agree with all the posters above - with one caveat: Some early Sunset (the unpainted era) came with brass axle gears. Those gears must ultimately be replaced with bronze, and last I heard, Sunset had the bronze gears.
I am a great fan of the NWSL non-tower mod 0.6, and use it in place of even the vaunted USH, as well as Lobaugh. However, these Sunset gearboxes are just as good - maybe better! Maybe lots better!