I was compressing mine off the car - by hand.
I tried that too - in the hope it would go away, it didn't. I hope you have more luck than I did.
After meeting the camaro guy (who had suffered a similar knocking noise on the camaro) I removed both front shocks and compared them.
One moved smoothly with even resistance for the full stroke but other moved about 1/4 or 1/2 inch easy then very stiffly.
I don't have an address for Koni in the US, I only have the address for the repair specialist in England.
TurboTim1 just sent his off to Koni, perhaps he can help.
Or - I just found these guys with a quick google search http://www.propartsusa.com/contact_us.php?
Based in Canoga Park, CA 91304.
No idea how near that is but it's at least in the same State
