Is there a manual way of adjusting the incline of the seats with auto adjustments?

[Puka Puncha]

I recently acquired an 1985 Carrera and the drivers side seat can only adjust to a certain point as opposed to the passengers seat(can recline alot further back). One of the seat adjustment buttons(closest towards front of car) does not work. I can hear a motor trying to move but no physical movement of the seat. Any way to adjust the seat(incline specifically) manually??

Thanks in advance...

Oh...great board btw. JKust by reading some of the posts, there's alot of gearheads in here.