Nope, that's not what they're saying.

The allen wrench (you are giving up because it's now a part of your airplane) is inserted into the top of needle valve. The Allen wrench itself is the extension.

Now the only thing you need to do is dig around in your collection of collars and find a little allen set screw to screw into the side to hold the allen wrench extension in place.

If you don't have a set screw it means a trip to your local hardware store to get one.