I've tried it under controlled conditions (RV camping with my parents, sister's family and her nieces) and was astonished at how difficult it was to keep the magnesium together and to get the sparks onto it.

I now consider the magnesium bar as a handle, not tinder.

I altered my kits to have a firesteel and good tinder.

This is the sort of thing the forum is so good for. Many ideas seem wonderful but they must be tested to prove them.

Unimogbert