Perhaps some of the images in this thread will help:
http://www.peachparts.com/shopforum/diesel-discussion/351621-removing-220d-injection-pump-pneumatic-regulator-diaphragm.html

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).