The unanimous agreement is the same as mine when first seeing the bow. I told the owner it was beyond repair but they wanted me to try and fix it anyway. Here are some pictures of the final fix; I didn’t think it would work, so I didn’t take any pictures during the process. In the first step I used Urac 185 to glue it using rubber bands to hold it together during the curing process. In the second step Urac 185 was mixed with fine Osage dust to fill the areas missing chunks of wood, then filed and sanded to the original shape. Next, the entire area (about six inches) was wrapped with bison sinew and coated with two coats of Zap-a-Gap. So far I have put around two hundred arrows through it and it appears the fix will hold, but only time will tell.
One amazing/surprising thing was the bow came back to a good tiller without touching the other limb. It wasn’t perfect, but good enough that I wasn’t going to mess with it anymore.