silicon-28 sphere(s?): <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=ZMByI4s-D-Y" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=ZMByI4s-D-Y</a> (yep, they let him palm it)<p>watt balance: <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=VlJSwb4i_uQ" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=VlJSwb4i_uQ</a>