Chiming in on preceding answers to Al Knoll's query on "proper bits for 1952 Hetchins," see:
1953 Claud Butler models
http://homepage.ntlworld.com/
1952 Holdsworth La Quelda
http://homepage.ntlworld.com/
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Peter Brueggeman
La Jolla California USA
4peebee(AT)peterbrueggeman.com