Welcome to the Jayco Owners Forums.
Hopefully someone will have had that same issue and can provide more details of what to do. My only thought is not all that helpful I suppose, but if it is not the center bolt then it is something else (other bolts such as the seats bottom frame bolts). What I would do is have my better half rock the chair back and forth while I looked with a strong flashlight every connection point on the chair's frame and base, and if that didn't allow me to locate the issue then I would turn my camera on video mode and take a video of everything under the chair with the chair being rocked back and forth and then carefully review the video.
Sorry I don't have a better answer for you, but again, Welcome to JOF
~CA