Airborne Flying Services of Hot Springs, Ark., developed and now offers the Valve Wizard, a set of three valve spring compressor tools for Lycoming O-235, O-290, IO/O-320, IO/O-360, AEIO-360, O ...

Several companies offer an on-head spring compressor; we chose the TFS tool, ... remove the locks with a small magnet, ... All LS engines utilize the net lash method for valve adjustment.