Step 4: Reverse it

Picture of reverse it
Reverse it all and put it back on the hub. Notice it only fits
one one way.

The lock ring thing has a super thin washer. Don't lose it!

Also grease the heck out of those threads, or it will be a pain to get off.

My Shimano 8 speed HG30 Cassette does not have the shim washer between the small sprocket and the lockring.

The inner surface of the lockring and the outer surface of the small sprocket are radially ridged to prevent loosening.