Knots on the back of the bow can be problematic, and no one likes wraps on new bows, but my method, and you may not like it is to clean that knot out to good wood , and mix saw dust ,and crazy glue, and patch the knot, and most of the time I wrap it afterwards. I have used saw dust,and crazy glue on limb edges with no wraps to save a bow with excellent results. I didn't invent the method, but who ever did had a good idea. When you mix the saw dust with the crazy ,and apply it makes smoke, and gets as hard as a rock.