1. First prepare the tools. Chain pliers (yellow handle, this one costs 20+ yuan on a certain treasure. It will be used when opening and closing chain links.) Toothless flat-nose pliers (blue handle) Teflon tape (if not available, others can act as a buffer You can also try the tape yourself) Finally, a pair of chains, D-rings and handy hands... The screw can adjust the size of the opening of the chain link. 2. Find the interface of the first link of the chain. 3. Use chain pliers to carefully open the chain link interface. (There is a screw on the chain pliers that can adjust the size of the chain link opening. You can adjust it as needed.) 4. Put the prepared D ring in. 5. Apply Teflon tape to the curved jaws of the chain wrapping pliers, and carefully clamp the chain link according to the curve of the chain link to close it.
Done.