Changing the timing chain on my '83 380SL

Appears as though there are 6 pins that are identical but another is unique.

The Slide Rail Guide pin is located behind a "threaded cover cap + washer" but from the angle, I cannot see threads in the existing pin? In the attached diagram I've found, which is the closest representation of my engine, it's Part #50.

I've ordered a new pin...MB Part 1160522874 (it hasn't yet arrived) but I cannot find any technical notes online for the inside thread of the pin?

NOTE: The other 6 all accept an M6...but this is too small for the Slide Rail Pin...

Simply, I am trying to find info about how to remove the old one so I can install the new rail and pin?

Thank you (all) in advance.
Christopher

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