Strange vibration can be heard when the clutch pedal is pushed down to change gear. It's much more audible at 2.5....3 thousand revs. Wonder if anyone knows how to cure this. It seems that all 1.3 diesel units do this and it is considered a trait of this engine set-up. My car is new and has only done 500 miles. Test drives with other similar models or different models with the same engine unit do the same. There was a suggestion that changing the clutch hydraulic slave unit for a Punto one cures it. Can anyone shed any light please.