Need help with a Cougar Armor S Royal Deluxe gaming chair

[stevencal]

As title mentions, I need assistance with the chair.
I bought it secondhand, and it seems that the cogs on the side that allows the backrest to go back have completely worn out.
Anyone have an idea how this could be fixed? I don't see the part itself for sale across any Cougar gaming website and am left without any options.

Thank you.

Link: Takealot