I have two sets of wheels, both laced to surly singlespeed hubs (the older "new" hubs, not the "ultra new" hubs which seem to make this process much easier).
Anyway the wheelset I like better has a quick release rear, and the other has a nutted axle. After riding the QR for a year, I've found I don't really like it. I wanted to go QR for easier on-trail flat changing, but since switching to the new (tubeless) wheels I haven't had a single flat. So I'm wishing I had the nutted axle on my newer wheels, as it felt a lot stronger.
What I'm wondering is if there's a way I can disassemble the hubs and get the nutted axle onto my new wheels. I haven't taken apart a hub before but as I understand it these hubs use cartridge bearings, which I suspect makes the process a bit easier.