Very helpful thread - was here also a few years ago...

http://www.peachparts.com/shopforum/diesel-discussion/164453-vacuum-pump-diaphragm-replacement-pix.html

EDIT: Looks like I had installed the discs incorrectly - the larger one should be closer to the engine.

This is probably why the diaphragm failed so quickly.

We shall see - have a spare diaphragm handy just in case.

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1991 300E 124.030 103.983KE 722358 03 412178
207K

1979 240D 123.123 250K (Project car)

2000 Ford Ranger, 187K

2015 Dodge Ram 1500 EcoDiesel 37K