In a message dated 10/21/2009 9:54:03 A.M. Eastern Daylight Time,  
[log in to unmask] writes:


I  don't think there's any (practical) way to resharpen  them.


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An early Berliner instruction Manual from 1896 (8-pages) that we  have 
reprinted advises that they can be individually re-sharpened, if one has  the 
patience. A different world back then...
 
Allen
 _www.phonobooks.com_ (http://www.phonobooks.com)