Giulietta door mirror

[pafiat]

The electrically controlled door mirror on my Giulietta has developed an irritating rattle. Before I tear into it, I wonder if anyone has had one apart? It doesn't look obvious how to attack it. Any suggestions welcome.

[GTVeloce]

What type of mirror is it? I have disassembled both the GTV6 type (with metal backing) and the 75 type (moulded plastic). The metal ones are much easier...