I have stuck a fixed cog on my old 70s hub off an Ernie Clements falcon.
I tried to stick the lock ring on but it doesn't seem to be able to get enough thread??
I tried the old pedal up a hill method to screw it on and actually snapped my right hand crank arm!
(was an old vintage alloy though)
Also, the alignment is way off... the fixed cog and chain ring are on a bit of an angle...??