Cut the grip off of the Tuff Lite with a hobby knife. It will be about 5". Now build up the wooden rod using the construction paper until the grip fits snugly. Since about 1/2" of the grip will rest over the threads of the pommel assembly and since measurements will vary from saber to saber I strongly recommend going ahead building the pommel assembly so that you can test fit it and get the exact dimensions of the grip AND the section of rod that need to be built up with the construction paper and duct tape. Once you've got the right measurements proceed with the thickening of the rod.