Is subject adjustment a round shaft with a slot that takes a flat bladed screwdriver which faces upward and require a deep socket to undo the locknut? After my engine warms up, it idles at 750 RPM. Is that too low or about right? I think I will leave it alone if not too low and just install a choke cable for a manual idle adjust. Anyone done that?

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked