Apparently there is a 22m version and a 23mm version.
The guy who sells the kayfun Black Editions is selling the 23mm version. Yours is 22mm.
You might be able to screw the nautilus base in from the side opening and then screw the tank on while the Kato is held upside down.
Have not tried it myself though.
interesting. I did not know that. but a little searching confirms two different ring diameter versions 22mm and 23mm.
the authentic Kato ring diameter is 23.5mm
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