Take superglue, put a little droplet on table or countertop or something that you don't mind they're being super glue on, and roll one edge of the PIN in the super glue droplet. Then, place with the super glue on it right on the Chain hole where it needs to be inserted and hold it there for 30 seconds or so to let it dry in place. Then, when dry, you want to place the chain with the PIN that's super glued back into the tool that you used to remove the PIN and tighten the tool to close the pin back in.