Picked up and older but excellent condition Giant Reign for my son - was a seriously expensive bike in its day, so it has fully adjustable everything.

I stripped down the rear shock to get some rust kill on the spring - no issues there. But, I wanted to reset the rates to stock. Stupidly, I backed the rebound damping adjuster all the way out - it's popped off whatever ratchet it was on in there, and the damping is now stuck at full. I can get the adjuster back in, but it's not reengaging with whatever it's supposed to.

Usually when I break shit, YouTube has the answer. Not this time! Any tips from the experts?!