Caretaker Rebuild Problem

I've rebuilt the 5-port valves using the Jandy's OEM rebuild kit. Everything seemingly went together smoothly but when I started the system back-up a loud rattling sound occurred. It sounded like one of the ball bearings was spinning around inside the top housing. I've since taken it apart twice in an attempt to locate the problem -- without success. All of the internal parts appear to be in their correct positions. The pistons stay seated when I turn the center plate over. The cam assembly impeller and gears spin freely and all 5 of the ball bearings are seated in their indents. There is no rattle when I manually spin the impeller.

Disassembling and reassembling the unit three times is about as much punishment as I can take; frankly, I'm at my wits end; . I've contacted three local pool service companies and they don't see to want to touch it

HELP !!!