[JMS] How does one "grind a crystal" to change its frequency ?

[cwforever at comcast.net]

Sherrill,

I have an old flysheet from Bliley which describes the proper crystal grinding technique. 

I will scan it this evening and email it to you.

Best regards,

de WA1ISA - Peter Dehman
-------------- Original message -------------- 
From: "Sherrill Watkins" <Sherrill.Watkins at dgs.virginia.gov> 

> Friends and Members of the James Millen Society: Please be advised that from 
> time to time, I see FT-243 crystals for sale in odd frequencies; i.e. that 
> are outside of the amateur bands and of no use. Years ago, I heard that it 
> was possible to "grind" a crystal to raise its frequency. Also, I heard that 
> one could "rub" a crystal with pensel graphite to lower its frequency. Yet, 
> I have never seen any article published in any major amateur publication 
> including various handbooks, or magazines such as QST, Electric Radio, The 
> Old Timers Bulletin, etc. as to how this process is be performed. Can anyone 
> refer me to a good source or explain the process in great detail? Also, what 
> is meant by the term, "overtone" crystal? Thank you very much. - Sherrill W. 
> k4own, member 
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