Good thing we now have a full hour to correct our little mistakes! Whish we'd have a full day (or more) though! Imagine putting a watch together and only having an hour to correct any mistakes we'd made!
That's the important detail, you may need to get a slightly larger crystal and cut it on the lathe (I don't think that can be done without) to re-create the lip, which sits on the top of the case. It may need cement to stay firm and partially waterproof.