I needed a hook for hanging the chain for my bird suet feeder. The chain I made using the excellent design by TrocheHole. I fitted this to the second largest chain links by TrocheHole.  The links of the chain can be attached directly to the loop after attaching it to the hook. Spread the loop to fit it over the pin - I suggest using a bit of glue between the ends of the pin and the loop. For outdoor use, I made mine with ASA. 

I needed to reach my hook way up to a tall branch, so I made a hook that can be attached to a threaded pole. I was able to place it over the branch and remove the pole. You will find that special hook on plate two of the profile.