Spool valves are precision assemblies where the spool and bore are a lapped/matched fit with very small tolerance. Once one parts wears out, there is not really a feasible way to “rebuild” them.
Thanks. I was trying to differentiate between the FEL control valve and the one that resides under the seat on the top side of the transmission cover, I guess these are also called spool valves?
Ok now my question to you is why you need or think you need the three point control valve rebuilt (and as Kenny said, you don't rebuild that valve you replace it)?