Dave--nice pens and good turning!! Vertex click is one of my favorites. I'd like to offer an assembly suggestion that you may find helpful--or maybe it's because i'm a bit of a symmetry freak. In my mind, that pen hardware looks better when the facets of the nib line up with the top section. I don't think it's mentioned in the instructions, but it's one of those details that the finished product benefits from.
So, my assembly sequence is to set the top section so the clip aligns where i want it on the blank and press into place. Then, fully screw the nib onto the tip connector--being certain that it's fully tightened. Sight down the turned blank and line up the upper and nib facets, finger press the tip connector into the tube, and then press it home. (that process is really only a few seconds--the key is just remembering to line up the facets)
At first i thought about making a jig to line up, but just eyeballing has worked for the last 50 or so i've done. Hope this helps.
earl