That makes things a little more complicated. The genuine Omega crown tube is more narrow than the rep. So, you will have to either fill and re-drill, manufacture a sleeve, or cement the tube in place. I've only seen one member attempt this. He used a cement called "Instant Weld" (or something like that). I never did see pictures of the final results, and never heard from him after that, so I don't know how it worked for him.
Another option that I have done on my black PO with stripped threads, is to simply shorten the stem, and file back the tube slightly. No more screwdown or swimming with it, but the crown sits and looks normal and cost nothing to repair :wink: