I have always used adjustable split boards for Coyote and Fox.
I make my own stretchers and I invented a flat hinge for the split boards that works great.
My stretchers are designed so that the boards are not very far apart when stretching a hide so I can tack the tail to the inside edges of the boards with the tip tacked to the cross bar, adjustment boards.
I only tack the first half of the tail open.
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