Guys pls. look at attached photo. Is this ALDA. If so, do I undo the outer locknut and turn center screw say 3/4 turn counter-clockwise??? Advise and suggestions welcome.

Reg in TX
85 300SD, Astral Silver
226K miles

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You got it. Just make sure you aren't forcing the screw.

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1987 300SDL (324000)

1986 Porsche 951 (944 Turbo) (166000)

1978 Porsche 924 (99000)

1996 Nissan Pathfinder R50 (201000)

Looks like someone beat you to it. From the factory, the ALDA adjustment screw has a sleeve around the locknut and the sleeve is filled in with wax.

Sixto
95 S420
87 300SDL

If you car is running fine don't mess with it.

Don't turn the screw more than 1/8 turn. Then test drive.