I have the standard Teleflex single lever shifter. Last week, all of a sudden, shifting out of neutral-to forward or reverse--has become quite difficult, needs a lot of strength to move it. I sprayed WD40 on the mechanism accessed thru the cockpit seat hatch--no improvement. Unlikely to be a kink in the Morse cable, because nothing was done to affect it. Once engaged in gear, throttle moves normally. Also, in neutral, no problem with throttle control. Any ideas out there?