Carter BBD Carb rebuild gone wrong.

I finally got around to re-cleaning the BBD. Took it all apart again, soaked everything in carb cleaner for over 24 hours, blew compressed air through every single hole I could find, replaced the accel. pump cover and put back together. Mostly same problems as before (except that now I do get a good squirt when I depress the accelerator pump down manually):

- Accelerator pump does not go down on its own when I give gas
- Engine cannot sustain idle in normal idle RPM

1973 Duster 318 Carter BBD: does anyone have any experience with these!?!

I cannot, for the life of me, figure out why the pump isn't depressing when allowed to. The new plunger is a little snug but seems to go up and down. I put a little oil on it.

Attached are two pictures of the linkage: one in idle position and one with the throttle up (you can see that the little pin on the top of the accelerator pump is not moving). Sorry about the crappy picture.

Is it possible that the plunger's spring is worn out?

Thanks for any help.