Download manual for Pro-Ject 2 which has instructions for adjusting the azimuth. Pro-Ject also manufactures the mmf-5 and the tonearms are essentially indentical. You must remove the anti-skate stub to access the azimuth adjustment screw.
http://www.sumikoaudio.net/New%20PDFs/Project/Pro-Ject%202%20User%20guide(3).pdf
http://www.sumikoaudio.net/New%20PDFs/Project/Pro-Ject%202%20User%20guide(3).pdf