Do you have a convertible mechanism diagram on 1990 Mercedes-Benz 500SL

The convertible doesn't open. A six sided alan wrench bolt on the locking-arm is striped. I need a diagram of the mechanism for the opening and closing mechanism on the convertible roof.

Asked by for the 1990 Mercedes-Benz 500SL
If you raise the roll bar , you can see a flat and rounded nut which can be turned towards the rear of the car with a 10mm wrench. The top can then be raised manually.