One other thought - my experience with the timing not being adjustable is on a 1990 560SEL; as I recall the timing on my wife's 1981 380SLC is adjustable, so the change was made some time in between - it may be that yours is adjustable so I suggest you check with those expert in the design for your year. Sorry if I mislead you. The pivot pin locations and their removal is probably similar to what I illustrated on my site