Hi mattman,
I went and measured the dental file on our jet pack. It is 3/8"high by 3/16"in diameter. You probably noticed that my first pictures of the pack show the file to be painted a blue color.At the time that seemed to be the color of choice. Later and somewhere in TDH there was a discussion of it being
closer to the jet pack green color and fading to a lighter yellowish tone near the top. After looking closer at reference pics. and ESB I changed to the
second colors mentioned. That change can be seen in the second set of jet pack photos with the black background in a later post. Updating is a
big part of TDH and is great for old and new builds. Hope this is helpful. Happy building!