I seriously doubt that the clicking is coming from the limb pocket lock down bolt.

A more likely culprit is the bushing on the top limb that the yoke on the buss cable connects to. The bushing sticks just a bit to the limb and under tension makes a click when it moves. 3 of my last 4 Hoyts had this problem. Put a small drop of a parafin based lubricant such as White Lightning on the bushing where it meets the limb. After a couple of shots, your click will probably be gone for good.