I would recommend getting a new climber. I believe API is out of business. I read somewhere that the motorcycle chains they used were rusting and then breaking on people while they are up in a tree. It’s not worth replacing the chins and using that stand. It will be more expensive to buy a new stand but I am sure you value your life/heath more than $200-300.
I had an API for a few years. I liked it very much. 2 years ago I switched to a summit and it is a far superior climber IMO. I think I'm going to throw my API away. I would not sell it to anyone knowing what they are capable of.