Oh no!  I just played around with one, and the pencil mech didn't work very well in the double twist mech for that pen.  What's odd is that normally, the pencil mech is a simple drop-in replacement for any Parker type pens.  So I'm going to have to give this a 'thumbs-down' unless someone else is able to make it work.  Sorry for the previous bum info. [B)]