I am not certain what bolt you refer to. A picture would be worth a few words -- but if you refer to the stop plate, there is a gap that is supposed to be there, it is not intended to "bottom"
Our friend Rusty's web site has info by Dan Penoff that describs this in his "how-to" on adjusting transmission modulator.
In his words:
"With the throttle linkage at full throttle the clearance between the flat on the lever and the stop pin should be 0.5 mm or 0.020". If not adjust the linkage to achieve this clearance."
see: http://transmission.articles.mbz.org/adjust/
There is a close relationship between throttle linkage and how and when your transmission shifts, just mess with the linkage and you will find this to be the case.
Dieseldiehard
1971 220 (gas) 4-spd manual 104041
1979 300TD w/ ’85 turbo engine 289560
1983 300D 237490
1985 300TD 206150
1975 300D (looking for an engine)
1987 300D 250K newest addition