The Flail U7 is a very simple, easy-to-use, and fun flail that uses chain physics. It can be found in the "Chained" category of the book from More Categories.

You can use the flail to pull the end of your weapon to the handle and pin it there. It'll do this by default when it's holstered.

There are a lot of settings you can adjust, and it has a lot of helpful error messages. It's set up so that it'll output helpful error messages. You can also make your own weapon using this same script. It's a chain gun, so you can use it to pull the end of your weapon to the handle and pin it there.