loading

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.
http://techdocs.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/CS/EV-CS-HG30-8I-2322_v1_m56577569830608755.pdf

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