Changing the Mini Pen Style Refill

This pen uses Mini Pen refills.  Change the refill by gently twisting and pulling the top and bottom portion of the pen apart.  The refill then unscrews from the bottom portion of the  pen.  The knurled nut on the top of the refill will then pull off the refill, SAVE THIS!  Push the knurled nut on to the new refill and screw the new refill into the pen.