Originally Posted by
Nerdy Norm
Or, if your old sprocket/driver is still serviceable, you can swap over the complete driver assembly to the new hub. Takes 5 minutes...
Yeah, if changing to a 3-spline cog I wouldn't get rid of the old driver- they're mighty handy for making DIY-dual-drives (add a freewheel, a long axle and a derailleur) and rare as hen's teeth.