I can see that there is tons of talk about ALDA but us non turbo folks are kind of left in the dust (both figuratively AND literally)

Is there any adjustment to an ADA?

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-Dan
1983 240D AT, 163K running on VO, "The Patience Tester"

Yes. Adjust it the same way, CCW to increase fuel, CW to decrease.

Can set screw be turned with ADA in place, or does it have to be removed first?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

It can be adjusted in place, just be sure to hold the locking nut and be very gentle (I'm assuming the ADA is similar to the ALDA)

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$60 OM617 Blank Exhaust Flanges
$110 OM606 Blank Exhaust Flanges
No merc at the moment

speaking of ADA adjustment, the OM606.910 also has this thing on the pump but has a black plastic cap thing in the middle which just rotates. If its adjustable does that mean I can get some more power out of this motor.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

That black thing is a cover for the adjustment screw.

More power? Depends on numerous things, adjust the valves, how is the timing chain stretch?

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83 SD

84 CD

My new 1984 300sd would start moving slower than I can walk, especially on a hill. After I took the little cap the off of the ALDA the adjustment took about a minute. I turned it about 1 1/4 CCW and the difference is amazing. Now I see why owners adjust it. THANKS!