I make this swing from rough lumber. I put it together with screws and bolts.I would like a good source for chain.If someone has some connection in this maybe I have a service or could help you with something.I also need to create a good source for a good rope that can be used for out door tree swings.I am a trader I have new doors and windows that I have bought that were overstock items that I can trade .I have been in the home building  and remolding business for 35 yrs. I come up with a lot of good deals on building materials.