I have a teres bearing from the group buy a while back. I have finally gotten my hands on the material I have been wanting. Work bought a 4"X 12" X 12" block of black Delrin about 3 years ago. I finally weaseled out of their hands and into mine. In square form it weighs about 35 lbs. I have had thoughts of adding brass weights to the outside diameter to increase the mass. Any reason that I should or shouldn't do this?