I guess it was working all along, but I was only using the numbers to select weapons instead of scrolling, so that is why I couldn't use it. Silly mistake on my part. Thanks!
I am trying to get the laser cutter mod to work, but I am having the issue where it is loading the thief gun skin, but it still shoots like the default gun. I believe I have followed all of the instructions correctly. I updated to the experimental version of teardown, installed the latest version of UMF and ran the hook file, I put the weapon folder in Documents/Teardown/mods, and I am able to enable it in the mod loader. But then when I load the game, the gun doesn't work right. I read through the comments and I don't see where anyone else is having a similar issue.