Hi there, i have boge f16 clearomisers and f16 v2 clearomisers i've bought the f16 cartomisers thinking that they are supposed to fit the f16 v2 as well as the f16, however i have found that the driptip won't fit back on the v2 clearomiser with the f16 carto in it...is this right or have i just got a faulty carto ???