@Bignasty
You can buy tubes from ebay, or if you are in EU (Uk) you can order tubes more easier from watch part store, dont have the link with me now, but I sure you can find the link in RWG.
@tribal
which tool did you used to screw the crown in, torx 8 or 9, or you own the real tool ?
did you remove some metal to allow genuine crown to sit right on the case ?
did you cut the stem, in mine it looks a little long to swap it without cutting 1-2mm?
Best,
Pedro