The case needs to be tapped and countersunk. The crown is stock ARF, I put it next to my gen 704 crown and man, there is no difference whatsoever. The DW in mine is still ARF stock, I don’t think I’ll overlay a gen DW. Now this watch is waterproof it’s finished for me. Gen crystal, gen click springs, WSO gen spec tube, HE valve has been bonded shut from the inside with marine grade super glue. All 5 crown and tube gaskets in place. I’m finished :-)