Just to avoid confusion:
The KW V2 did not come with a BOOK. It came with a couple pamphlets which were pretty much worthless. 3/4 of it was in German.
Also, the "big metal keys" are used for adjust the FRONT coilover height. The rear height adjustment requires you to remove the control arm bolt which allows you to remove the spring for adjustment. The instructions specifically state that you need to remove the rear spring in order to adjust the heigh for the rear. The big metal keys are not used in the rear at all.