I know ya didn't ask me but I found some rigid handled Northwestern Costal bows with stiff handles, some from the Bearing Straight Eskimo, and some from the Northern Sioux, and the Northern & Western Cree. The Costal bows are attributed to the Tlingit and the Yupik (western Arctic), and some from the Makah.
I dont want no part of the arguement, but here's the pics. PS: I did not check all the bows but I know that one was collected in the 1800's by an Army Officer.
rich