LH headlight

[garyhugo]

It seams there is always something to repair on a 28 year old C4 corvette. The LH headlight this morning decided it would only open 3/4 of the way. I grabbed my section 8A supplement to the FSM and after an hour of doing the diagnostics it appears they both should be working. Then I discovered I could manually spin the motor and close the headlight. tried again and the same thing,opens up 3/4 way and stops.Then I decided to spin the motor to open the headlight all the way. It was very difficult to manually spin the motor to full open but I did it. turned the lights on and then off and the headlight spun closed.Turned them on and it stopped 3/4 open again.The headlight assembly is not bound up,I can easily move it back and forth freely an inch where it stops. But I can no longer manually spin the motor to full open. I can only spin it to close and the motor will close it.
The nylon gears were replaced about 10 years ago.Does anyone believe they could bind up in this fashion or is there something else going on?