LOL, you were probably low on electrons in your camera anyway....
How about the physical mechanical connection where the slave works...
any binding there ?
You have to go back and check everything... you can not assume because you have checked something already that it is off the list of potential problems... not fun... but can save you time in the long run... I have had things like this where I had to close the garage door and come back a week later.... and sometimes sleeping on a problem does help.... confirmed by scientists and talking about on Charlie Rose a lot lately...

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

not as far as i can tell. the clutch sorta functions in a sense - if the pedal is released it does not engage, but it seems to be almost barely touching because the car will roll slowly forward with the brakes off in 1st but couldn't go up my driveway. if i push the pedal in, it has a normal clutch pedal feel, the lines are bled fully, and the clutch becomes absolutely 100% disengaged (i.e. no movement whatsoever).