I build a lot of board bows.. A picture never does justice to the need. However It is my opinion based on the photo you have given , back this stave with bamboo and you would probably be safe. If you have doubt, as it sounds like you do, can you return the product or is there even that option ? I have successfully built bows with knots ( osage) but run off knots, not like yours are a concern. I learned in early days of my building fellows built around the knot and sometimes cut them out and plugged them. That being selfbows ! But board bows are a lot more touchy, cause of the violation of grain, thus requries a pretty descent stave to work with. Good luck I hope this helped. Denny