One thing to watch out for if you glue/weld/whatever the cog/freewheel on too tightly is repair -- I had the chain jump off one time and it ripped some spokes out, and at that point I was glad I'd used threadlok to hold things together so I could get it apart again to fix the spokes. I don't know of any way to fix broken spokes with the gear still glued in place..

(this is red needs-a-blowlamp-to-undo threadlock, the blue stuff came loose on me one time and that was _no_ good)

-- dan