If you can get a raw deer hide, or goat hide, you can make your own. Just scrape off the hair, if it is already dry, or put it in a frame, and lace it up tight, and scrape it off, if it is not dry, and thin the thicker parts on the back, with a rough stone, or 60- 50 grit sand paper, on the underside, after it is dry.
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you now have real raw hide. Draw the out line of the piece you need, and mark off even spacing for the lace holes, and use a drill and small drill bit, and then wet it, and and sew it on, and let it dry.
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Pappy probably can tell a better way than me, as he is the "Man" in the brain tanning, and raw hide area.
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Wayne