Btw, there was a TV show in Sweden (Teknisk Magasin) that ran from 1957 to 1987 that had these: http://svt.se/svt/jsp/Crosslink.jsp?d=46923&a=525630 Garth Rodericks skrev: > Throw a set of these in your ZF... > http://hackedgadgets.com/2008/09/10/non-circular-gears/ > > http://www.8625plus2.com/products/ncg-en.htm > > >