let me reword this for you babs:

question. after installing the drive sprocket on the rear wheel. Will the back hub be fixed or free?

situation. in the instructions they say remove the dust cover on the rear hub when installing the drive sprocket, put it aside and then they forget about it. What happens with the dust cover?
I installed the sprocket and the hub is fixed now. I wouldn't think it would be like this. But then again I haven't built one of these before. I didn't take the time to true the sprocket yet just in case this assembly is incorrect.

Bike. Dresser