From what I can tell based on discussions with some Mercedes Benz guys (and please dont take this as gospel !!!) the internal adjustment screws on EP/RLA regulators are located on the
1) Rack head (overall adjustment) - internal adjustment
2) Caspule - centre screw - idle adjustment/CO - accessible without disassembling the pump.
3) Capsule - 2 x black screws 450-1000rpm (pump rpm)- internal adjustment
4) Capsule - 2 x white screws >1000rpm (pump rpm) - internal adjustment
The screws and springs in the capsule control the amount of fore/aft movement of the space cam with changing engine speed. The throttle control lever provides the rotational position of the fuel map
The picture clearly shows the center (CO) screw and the 2 x white (high speed) screws - the 2 x black screws (low speed) are too black to see, but are the remaining 2 screws on the capsule head
Heres the screw on the rack head for the "overall" adjustment (top of image - it also shows the position of the capsule between the flyweights of the governer.
I'm sure it would all be explained in the Bosch document VDT-WPP 711/1B....anybody care to share a copy ???
Note that some racing pumps use modified flyweights (lightened) to further alter the relationship between pump speed and space cam fore/aft movement.
This ones from a 935 pump (c) B.Buschen.
