Cannot "carefully drive" upper shaft out of power trim and tilt unit (Yamaha P/N: SH1-10) on my Yamaha 70 HP (SN: 466196). It is corroded and I have successfully removed the lock rings. I have used liquid wrench twice and Wurth saBesto Bost Off Ice, twice with drive-out pin and hand-held hammer but with no luck. Any suggestions other than directional TNT or C4?
