On condition inspection at 300 hours noticed too much play in AST. Disassembly revealed slight wear in the AN23-15 screws in the pushrod assembly, enough to make them a slightly loose fit. See photo here.
Grooves in screw almost invisible, but detectable with calibrated thumbnail. Another good thing to check on preflight and at annual time
Grooves in screw almost invisible, but detectable with calibrated thumbnail. Another good thing to check on preflight and at annual time