Replaces the original to make it compatible with universal pen cartridges.

No modification needed!!  No adapters needed!!

NOTE:  Certain type (shape/size) of cartridges require the use of included spacers.  Two removable spacers are included and one self-centering spacer that is glued in place as a permanent solution.  Recommended to use spacers only if/when needed.  Use only one or the other.