The drivers door handle of my '75 2.0 doesn't work. I can open the door from the inside but not from the outside. With the door open everything works fine. I took out the door handle with the lock , looks OK to me , but the cam actuator bends a little bit when I pull the handle. Would new cam actuators do the trick or could there be another reason?

Yes it is the plastic slider that needs to be replaced, Old ones break and new ones are too soft and will bend sometimes.

You also need to remove the latch mechanism and clean and relubricate it. When the mechanism gets difficult to operate due to 50 years of grease, dirt and grime, they start breaking and bending the plastic door handle actuator.

After removing the lock/handle, you should be able to easily push the mechanism through the opening and open the door.. if the mechanism is tight, remove the door panel and soak everything with WD40, while moving all the mechanisms, including inside door lock and handle.

I did all of the above with no result. So I will order new actuators (Mikey has all the stuff I need). Thanks to all of you for your advice.

That will take care of it.

Exactly. Remove the door interior panel and get the latching/lock mechanism out and on the bench. Remove all the 50 years old crud and lubricate the moving parts with engine oil. A new plastic actuator should get things back on track

It's not just the door handle that may be the problem. You need to remove the latch mechanism from the door and clean that and lube it too. Also if the car has rust and is sagging the door can be out alinement. The handle is the weakest link but could it the first sign of larger issues.