Z rod guide

Hello
Shouldn’t there be a bigger washer(today a M8) under (on top of the M8 locking nut) and over the Z ROD GUIDE? When I’m tightning the second M8 locking nut, the Z ROD GUIDE slides down and away from the 608 ball-bearing-thingi. (pages 186-192)

Thanks in advance.
Ivar

PS Started assembling last monday, and so far all good. Bag 26 contained a M8 washer and 2 locking bolts extra?