ORIGINAL: Arthur P

BC, that crack is actually in what is essentially a non-working area of the bow, so I think it's not that big of a problem. What I'd do, if it was me, is this:

1: Take some liquid super glue and try to get some to seep down into the crack.

2: If not, coat the area with epoxy and wrap it tightly with heavy thread, color of your choice. Upholstery thread is what I'd recommend. Just one or two layers should be plenty. Finish the wrap just like you're serving a string to make it look nice. Just make sure to keep the wraps tight. From the photos, I can tell you'll have to remove your leather plate in order to wrap it right. If you've got access to sinew and hide glue, that'd work too.

3: Coat the wrapping with polyurethane to finish.

4: To make the wrap look like a decorative feature instead of a repair, measure down the same distance from the center of the bow and put another wrap there. Epoxy, wrap, poly, just like on the actual repair.

I've done this repair even in working areas of limbs and had it hold for a long time, so it should do just fine right there next to the grip.