I just grabbed the camera to take some pictures but Kempe's done an excellent job of that already. Now I got some spare time to start removing some rust

wohoo!
Mine looks exactly the same. No difference I can tell between the 430 and 590 including the three dodgy drilled holes. I'm guessing they rolled out of the factory like that.
Do you guys think a silicon lubricant would be best where the 3 pawls sit? I'm guessing anything greasy could clag up. It probably doesn't need anything but I would like to make sure everything is at its absolute best before putting together.