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It may be the clutch power spring that is causing the squeak. You could remove the spring to see if that is, in fact, the source of the offending sound. If you decide to remove the spring, be warned that the clutch pedal will feel much stiffer without the "helper" spring.
If the spring is the source of the sound there may not be much that can be done to eliminate the squeak.
How difficult is this part to replace? My clutch pedal is so hard to push down. I think there maybe something wrong with this part on my c2s. I've driven a few other 997's and their clutches feel like Honda's compared to mine.