Never posted any pictures before, let's see how it goes...
On the left, a brand new good pin, on the right, the faulty ones :
This is how it looks when all is screwed togheter:
Just to be sure, here are the links to the pics:
http://img842.imageshack.us/i/2pins.jpg/
http://img859.imageshack.us/i/4pins.jpg/
http://img695.imageshack.us/i/cvd1.jpg/
http://img808.imageshack.us/i/cvd2r.jpg/