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Most of us had one of these as kids. At least some of the older ones. http://www.designnews.com/author.asp?section_id=1386&doc_id=279760&cid=nl.x.dn14.edt.aud.dn.20160106&dfpPParams=ind_183,kw_24,aid_279760&dfpLayout=blog My mechanical engineer has suggested putting a thin sheet sheet of...