Originally Posted by
JohnDThompson
AFAIK, that's the only way to remove the cog from the driver. Sturmey-Archer actually recommended replacing the threaded drivers with splined drivers once the splined driver became available.
That's how I did it as well:
I've had rear sprockets that that were so stuck they would have destroyed any wrench/bar/ vise. The best option is to use a hack saw and cut diagonally thru the sprocket until just before u reach the thread of the driver. Put a pipe wrench so the trailing jaw grips the first tooth beyond your cut. With moderate force the sprocket cracks and peels off the thread.
Needless to say the sprocket is toast.
Heat , surprisingly, makes no difference in my experience.