If your going to use tip overlays you might want to fill in the nock on the back of the bow with glue and sawdust.File or sand the tips flat and smooth for the length of your overlays. A dark wood like walnut look performs well on osage. Then glue the overlays on, most any strong glue works well from 2 part epoxies to wood glue. I always use ttb3. good luck with the bow.
