The common practice for making a paracord keychain connector is a simple overhand knot. However, after trying this, I soon noticed that the large, bulky knot kept sticking out at odd angles and got in the way when trying to release the tool from my keychain. So, after some research, I found a knot used on a Monkey Fist Keychain which I modified for use on anything with a lanyard hole. Shown is this knot on several of my keychain tools, as well as the drop-leg attachment for my Esee-4.
Step 1: Pick your Cord and Tool
Before you tie the knot onto something, you need something to tie, and something to tie it onto. Paracord works the best for things like this, but any nylon cord or rope that oyu can fuse the end of will work, depending on the desired size. For demonstration purposes, I'm using a bright red piece of paracord, about 6" long. It does not take a lot of cord to make this knot, but once again, depending on the size. The Drop-leg knot took a lot more paracord than the keychains.