Here's a link for a Volvogear driven waterpump that is found on many sail boats. Though the gear drive and shaft connection are not clearly shown, they are a great example of an interference fit.
Schematics many times don't make sense (damn engineers<grin>) until you have the part in your hand. I agree the nyloc does appear to backward. Bolt #7 is actually facing in the proper orientation but again you'd have to be looking at the front of the engine to see how the water pump is bolted on.
OK I'm stumped, what's a plant donkey?