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.
Step 2: Loops!
Start by running the cord through the lanyard hole or ring or whatever it is on the desired tool, and make a loop. This will be the first visible loop. The short end of the cord should run the length of the finished knot for a keychain, and about halfway through for anything larger.
Then, take the longer end of the cord and make a loop around a half-inch long from the end of the short piece. This will be the second visible loop.
Next, with the long end, make another loop starting just above the base of the first loop and running back towards the second loop. We shall call this third loop the "auxiliary loop."
Step 3: Wrapping
Below the second loop, start wrapping the long end of the cord around the entire knot downwards. Make sure to cover up the short end of the loop in the process, and wrap it very tightly. When oyu get as for as you can without going past the auxiliary loop. Then, put the long end of the cord through the auxiliary loop. This will lock it from moving. To make it tighter, you can pull on one side of the second loop to pull the auxiliary loop against the long end harder to hold it in place better.
Step 4: Fuse End, the End.
Cut off the excess cord after tightening everything up and making it flush, then carefully fuse the end so it makes a "knob" right against the auxiliary loop to keep it from slipping through.
Congratulations, you now have a double sided loop paracord knot type device. You can connect it to carabiners, s-biners, anything with a lanyard hole, around something without a lanyard hole, for use as a drop-leg attachment, or whatever you want to use it for. The End.