In my experience, if you have to ask,.... as in, if it doesn't look like much of an issue, but you want to be sure, that kind of tiny crack will work out as you scrape and finish the bow. If not, then examine how deep it goes. On reflexed or recurved tips, I can usually save the bow by grinding them down and adding thin belly overlays to build it back up.. But sometimes not.
I recently got back to a wild, snaky BL stave that had a deflexed kink at the handle,a snake bend, and lateral roller-coasters all in the middle 30% of the bow. I cracked that thick handle section up in three places, and in wild ways that corresponded to all the weird grain. I ended up sawing strangely angled kerfs into the splits to widen and square them, and inserting thin splints of ipe to fix it.. The handle looks weird.
