Alda repair or replacement
 

The car in question is a newly purchased 1980 300sd. I just noticed that the alda screw seems to be missing. Performance of the car is very good so I don't think there are any issues there. I have a 1980 300sd parts car with an alda that has not been touched. So my question is can I fix this? If so, can I replace just the screw or will I have to swap the entire alda housing?

If you are talking about the adjustment screw in the center. It can not be reconnected to the bellows inside. Install a new unit. I f you adjust the replacement only a quarter turn at a time and no more that one full turn.

I wouldn't change anything with it, putting an untouched ALDA on there will just make the car sluggish and less enjoyable

X2 if it is working OK without the Screw why look for trouble.

I threw my ALDA in the garbage 2 years ago runs good 30 mpg average