Yup, I did find that video of his. Although, I would prefer a more elegant solution than that if possible. I'm thinking about maybe turning something from aluminum in the shape of the pens, but with a threaded cap at the top to make for easier refilling? Although I would still need some of the pens to figure out how the tips/nibs are constructed/inserted. The unit I just purchased only came with a handful of pens, not enough for a full set of eight that this unit is able to take.
Unfortunately, I can't use his method of full size normal pens, since this is a carousel model, it has a height restriction due to the enclosure, and I would prefer to not have to modify it.