Nobody asked, but after I broke down my work set, I threw the pen back on the table for another configuration. I also have possession of two other pens now, so while I do, I thought I'd include them as well, so you can see the differences between them, in how they reflect light.
One is a brushed silver surface, which does not cast much direct reflection at all, except in the ring/collar and the clip, so I was able to use the exact same set-up as the pen we've been looking at. The other is a polished silver surface, which casts almost entirely direct reflections. In this case, I changed the set around a lot. Though the light using the original configuration was pretty good, the black end caps had absolutely no highlights. Whatever that material is, it sucks up light voraciously. So I repositioned my lights to use them as a tent, letting them reflect in those black areas and creating a bit more form. I also added one light to keep the light coming from underneath, so this was essentially a triangular light box. Again, given more time, I would have probably made those particular highlights more prominent, but you get the idea.
#8: I modified the interior of the "tent" by adding a black-faced bridge over and behind the pens. It probably could have been moved a bit further back, to split the difference between the shadow here and the prior example. Other then that change, everything else remained identical from previous examples. (Note that there was also a white board covering the back of the set, casting light over the back edge of the pen, but I had to move it to show the interior of the set. you can see the edge of it on the right of the image below.)
#9: This shows the front and rear views of the set, from slightly above. A very simple set. The black line across the pen body is the seam between the soft boxes, which had to be primped to run straight. If I had faced the light closer to 45 degrees to the pen I would have improved the highlights on the black, but I would have had to control them more carefully on the pen's body. I could have also centered the clip so it caught some of the black, that might have been nice. Also note that the board covering the back of the set was standing up straight bu y in the rear-view photo I had to tilt it back so I could so the inside of the set. It is acting as a bounce care, just like in the example above.
Given the time, there are many tiny details one could spend hours fine tuning, but add up all those details and you'll end up with a stunning photos, so, depending on your inclination, it might be worth it.
Remember, these are not stunning photos and are not intended as final products, but as guides to give you some new ideas. They have not been retouched, so what you see in the behind-the-scenes images is what you get in the pen photos.
If people are interested, I'll do another one of these tutorials in a more environmental context. I know pens-on-white are a bit "e-commerce", but they are great for documentation.
Hope this helps.