The paws must be in time, but there is a spring that returns the lever back to the rest position. If the mechanism is dirty, it will not work properly.
I take out the seats and clean and lube the tracks well.

Good luck

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Benzmac:
Donnie Drummonds
1991 GMC Syclone
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM