Aren't they usually held on by rivets? At least the ones I've seen. Those should be easy to make and food safe, as long as you use a nontoxic metal lke steel. I've not tried it but what the hay?
Norm

Either mechanical fasteners (rivets) or brazing. Or even a thread rivet welded onto the oustide of teh netal and screws.
Be careful if the inside is not tinned. Copper is dangerous in large doses.