compound shutter will only fire one speed?

[koh303]

I am trying to understand why a compound shutter is only firing one speed (fast, i beleive this to be the fastest the shutter will fire, about 100th of a second.

I have it apart, and found the timer weight was seized due to corrosion, which was easy to remedy. However, now the timer arm does move freely, the shutter still only fires max speed. I am assuming there is another spring missing on the cocking/firing lever?
Does anyone have any diagrams of this shutter?

[ic-racer]

http://www.skgrimes.com/library/used-obsolete-discontinued-shutters/compound
http://lommen9.home.xs4all.nl/shutters/compound/

[koh303]

UNBELIEVABLE!!!!! I just read the second links header about the shutter being controlled but a pneumatic retarder, and then noticed i had left out the "seal" that was under one of the end caps on the retarder tube. Seal is back in place and shutter works like a charm!!!

Thanks so much!