I have seen several of these and on the last one I did we coated the bushings, spring clip and pivot points with a very very thick grease which Toyota uses on front disc brake shim pads (Toyota disc brake grease) and also Ford has the same type of grease they use on suspension bushings, this stuff is so thick and sticky that it won't come off and very heat resistant, you will have to remove the clutch pedal and disassemble it to do this but I think that there is a good chance that this will cure the problem, only time will tell, I will keep you guys informed on how it does.
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