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Ok,
Pulled apart a spare ALDA and inside are (2) copper discs, that appear to be under pressure. There is an 'O' ring that seals the upper and lower halves and there is a smaller 'O' ring around the plunger stem on the lowermost copper disc.
That's it. No springs and nothing to really jump out at you.
Testing this ALDA I discovered the plunger moves out when vacuum is applied and the plunger retracts when pressure is applied.
The unit I pulled off my car leaked around the plunger and you could blow through it with only slight resistance. Although I simply replaced it with a better used unit, changing the 'O' rings is very simple.
I have found the best performance in my 300SD (after much experimentation) is 12 psi of boost, the ALDA all the way out CCW and 3.0mm shims between the ALDA and the pump.
Normal driving at 65-70 mph I am producing 10 psi of boost and the acceleration is remarkable for a 617. Shown is my boost gauge rigged for So Cal freeway testing.
I will post photos of the ALDA's internals later this evening...Robert
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 Did you just pass my 740 at 200 kmh in a 300SD?????
1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013
100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership 
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