Hi kiko, I dun have any spare leh. Only got the 2 from my previous 2 catridges, the rest I threw away liao...
But I think u can use the white tape you can get from the hardware stores and tape the inlet of the Crystal Pro cannister. It should be able to work since what you want to do is to prevent the water from gushing out.
Will try to do this later when I have the time and see if it is workable.