L. Chao, S. Schlamminger, D. Newell, J. Pratt, G. Sineriz, F. Seifert, A. Cao, D. Haddad, and X. Zhang. (2014)cite arxiv:1412.1699Comment: 11 pages, 6 figures. Also included is a partlist to build your own LEGO watt balance. The article has been submitted to American Journal of Physics. After it is published, it will be found at http://scitation.aip.org/content/aapt/journal/ajp.