Espen,
I believe the pre-filled carts are the same as the empty, easy-refill
carts. MIS might use a different stopper. So, you may have to use a
little jeweler's screwdriver or the like to remove it.
Paul
www.PaulRoark.com
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> The prefilled mis 3mk carts i bought from mis looks to be exactly the
> same as the empty refillable carts i bought from mis for the r1800..
> I have tried removing and replacing the fill plug with success..
> Could this be the case? that I can refill these used carts I have?