The pin is for locking the grass cutting string device. You'll find a small hole in the spindle housing for inserting the pin.. That will allow you to tighten up the device.
I believe that the blade rotates counter clockwise as viewed from a standing position and believe that the print is facing you. ( Check that out).
I believe that the blade rotates counter clockwise as viewed from a standing position and believe that the print is facing you. ( Check that out).