Hi i am trying to replace the delivery valve o rings on my 1985 190D, DOES ANYONE have any tips on how to accomplish this without the special socket required? i have in the past used the "keys" that hold the valve by tapping them gently with a flathead screwdriver a few times until it opens, but this time i am doing more damage than good and it doesnt seem to be loosening.
Any help is appreciated, am stranded. thanks