I have an older model Martin Hatfield TD. It has the Blueish gray riser. I have a ckack on the front and back of the riser. Not in the throat or in the shelf. When I unstring the bow I can not see the crack. But strung and shot at #75 the crack shows up. Can that be repaired> Thin Super glue was suggested by someone. Do I just pour the glue into the crack at full draw then let off? That seems to be the only way for the glue to get in the crack.