....another thing that might be relevant: much earlier in this thread someone posted that you should have 35-40mm free-play at the pedal. Your Fiat 500 appears to be the later type and we have started to discuss diaphragm-springs, so I'm assuming that it is an "F" or "L". If so and certainly if it does have the superior (and I'm not joking here) clutch-type, the free-play is significantly less that that, being a miniscule 15-20mm; on my car I err towards the lower figure.
This maybe doesn't change the situation at all but might be relevant with a new cable and also means you aren't failing in the way you were thinking in not achieving the correct free-play at the pedal.
This maybe doesn't change the situation at all but might be relevant with a new cable and also means you aren't failing in the way you were thinking in not achieving the correct free-play at the pedal.