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HI. If you have to sacrifice the existing tube, you must take a pair of pliers with pointed noses and remove it without twisting to avoid it breaking. I repeat, the tube should be the one with a snap-fit (without thread). Otherwise (i.e. with a screwed tube) you must unscrew it counterclockwise. Having said that, I still recommend that you first purchase the tube + crown kit and test its compatibility with the existing tube without disassembling it. If it is not compatible, you can proceed with disassembly. Oh by the way, it's the same all over the world...I think that every place in the world can have its positive sides, but also its negative ones. Have a nice day.