I purchased a beautiful hand hewn walnut beam that is 10ft X 6in X 7in. I plan to hang this onto my wall studs using three 7 inch lag bolts that are 3/8 in diameter. I will counter sink them and fill in the holes with walnut dowel rods. I have never done this before, but someone told me this is a safe way to hang such a large/heavy beam. Any ideas?