You could put an overlay over the joint. Also, I have started using wrapped handles for my bows using hemp cord from Wally World and set it in Massey finish(2ton epoxy thinned with acetone). I first did this on a bow("Trouble Maker") a boo backed hickory(now a tri-lam with osage belly) that kept coming apart at the handle. Once I used the hemp wrap, never had the problem again.