Finally did this one and two things come to mind. To me, the point of the rollerball could stick out just a little further. I don't like the writing feel with it that far in. Maybe if I got brave and open up the inside a little just enough to have the point protrude just a little more? I tried other RB refills and they all protrude only that far.
Second, the loose fit of the upper and lower end can help when lining up the cap when screwed in for posting and lining up the grain of a blank to match the cap and/or posted cap clip lining up with a fountain pen nib for aesthetics and balanced feel. A little to loose fitting for me but I get the point of not fracturing a blank with a real tight press fit. The cap of the one I did was very tight to screw on. All in all this plating color and look is different. Color matching this to your blank is a matter of taste. I decided on Redheart. Ignore the price, I was fooling around with Photoshop and wanted to see what the text looked like. Either way, this component set has its merits and could become quite popular. Thanks to Jon of Signature Pen for this offering. He's a cool dude to talk to also.