I made a short recurve of red oak. Actually out of a stick that the two high school guys passed up. In short, it cracked. A nice, long splinter running in off the back. I glued it, and backed the bow with heavy brown grocery bag material. I cracked again. I glued it again and covered the area with more bag. It cracked again.......
So, I resorted to the old "sinew on a spool", dental floss. Unwaxed, plain white. Wrapped on in close winds for 3/4 inch or so over the end of the splinter and then over wrapped back the beginning. I dosed it with thin cyanoacrylate. Now it's holding. I may put a wrap to match on the other limb, just to keep balance in the universe.
It's not that I NEEEEED that bow. I just thought I may as well try to save it and learn something in the process. Knowing how to repair this sort of damage might come in handy sometime.
piper