"So why did Masi do it the easy way for about one year (1972) and then come up with a real twin plate crown that was a disaster and abandon it within a year or so? "
Brian,
Can you expand on this point?? Why was the Carlsbad crown a disaster? Was this a production related disaster in terms of 'slow and difficult to make" or is there an inherent flaw in this crown?
Bryant Bainbridge
Portland, Orygun