After Gael told me I had the first actuator upside down the assembly went a lot better. Here is a picture of it together but with filament pins still sticking out. I haven't done the servo assembly part yet.
And a picture with the finger flexed. The end joint does not flex yet. There doesn't seem to be a mechanism for making that joint move. I can see that there is a hole in the end piece without a way to insert a pin and no matching hold in an actuator. I may still have an assembly error. Important part here is that rotating the gear part flexes the finger.
Here is a shot from underneath to show where I used my exacto knife a bit to make clearance for the gear to rotate.