also, this was very helpful to me when I was owning one: http://www.tindonkey.com/2010/12/herd-of-tin-donkeys-1960s-bauer-track.html
http://www.flickriver.com/photos/nickelbike/sets/72157622461417723/
nothing about the bb shell though, maybe its worth contacting these two guys^?
@1000archangels started
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also, this was very helpful to me when I was owning one:
http://www.tindonkey.com/2010/12/herd-of-tin-donkeys-1960s-bauer-track.html
http://www.flickriver.com/photos/nickelbike/sets/72157622461417723/
nothing about the bb shell though, maybe its worth contacting these two guys^?