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It's a little tricky but certainly enough to give them a quick visual check anyway for being installed the right way around and not chewed.
@BuggyofMildDiscomfort thanks for the pointers, much appreciated! I can see them now just having trouble determining whether they are the right way around.
I know grooves face towards crank. Am I looking for the slight slope on either end of the thrustwasher face?
I have some old ACL thrustwasher from the broken engine.