Hi,

I saw the brilliant pictures g the 560 bosh KE-Jetronic Distributor with the nut which hold the plunger and barrel in position. I took mine appart and did not record the position of the nuts. You got the outer ring nut which holds the barrel in place and then the innter one with the rubber seal which screws inside the outer nut. You can set the inner one deeper of higher into the out one. What should be the correct position.
For example i presses the inner nut (the bruubr ring side) as far as it would go into the barrel and then turned the outer one over it till t seated on the distributor housing. one can however with a screw driver turn the inner one out again. (Hope I made sense here)