Ahh, Reman, I have the regular size Rose (clone), not the stumpy. This is the reason I never tried a KF tank. You might try forcing the KF tank on, knowing that you won't remove it again, and that it is expendable. If it compresses the O-ring it might work.

Damn, why can't Ft simply sell the tanks. They have no problem getting the whole atomizer. Some chinese guy must be injection molding these by the thousands.