My girlfriend has come back tonight and said here driver side blade is not moving on her FIAT PUNTO SPORTING. I have looked under the bonet and noticed that the arm has fell off for that particular blade. Will I need to get a complete new mechanism and motor or can I just replace the arm? If so does anyone know how to do this?

Cheers,
Simon.

Depending on year of your punto a complete assembly starts at £57 from dealer i guess its the linkage which drives the passenger side wiper arm from the main wiper its common on the mk2 you can force the linkage further on than it should go then it wont come back off its very hard to do i used very big pliers and full foce once it pops right on it aint coming off again trust me it need to be on as far as possible so the knob bit cant go any further into the hole the problem is though the plastic lining in the hole wears down.. Or you can buy the new mk2 if it is an mk2 your girlfriend has the upgraded wiper linkage only £65 heres the link... https://www.fiatforum.com/punto-technical/29022-mk2-punto-wiper-linkage-upgrade.html

CHEERS MATE. THATS GREAT ADVISE!!!!!!