What doesn't work? Does it fire? Is the exposure off? As you can probably guess, since the Metz is 15 years old, flash exposure capabilities are very different today than 15 years ago. Also, Canon and Nikon technologies are different. However, if he wants to use the Metz as a manual flash that is probably possible. Tell him to contact Metz.
John Herrel Nikonian from South Carolina See the light, capture the essence!