Seat Back Adjuster - Misaligned

Hi all,

In a quest to make myself fit better into my 79 450SL I was turning the seat adjuster knob and the seat became misaligned.

I.E - The left side of the backrest is more forward than the right side.

Does anyone have any advise and it appears to be not turning the gear. I sprayed some penetrating lube on the gear itself in hopes of freeing it up but didn't have any luck.

Any advise is appreciated.

Thanks!