TWAIN commerative Pencil Holder

After the Tigard High School Technology Team's 2018-2019 season, we decided that our promotional T-shirt Cannon, "TWAIN" (Technology Without An Interesting Name) needed to be retired. It had been in operation for 10 years, and despite iterative upgrades, the cannon was showing its age. As it is going to be entirely replaced, I decided that a commemorative piece should be made in memory of the cannon. As I was putting it together, I noticed that the barrel diameter was similar to that of a pencil