DIY valve seat grinding| Grassroots Motorsports forum
WEBFeb 20, 2011 · That makes them either very expensive or very cheap. I got lucky and found it cheap. 9/16"16 to suit grinding stones made for old black and decker valve seat grinders. A " stone, a new 7mm drill bit and some 7mm drill rod. Some scrap 1" aluminum rod saced itself to the lathe to become my arbor.