The basic procedure for accomplishing the frequency changing grinding operation is covered in:
"Radio Handbook, Twenty-Second Edition" by William I. Orr, W6SAI (1981, Howard W. Sams & Company, Inc, Indianapolis, IN 46268), on page 11.7:http://home.netcom.com/~wa4qal/crystal.htm
Crystals may be raised in frequency by grinding them to smaller dimensions.
Hand grinding can be used to raise the frequency of an already finished crystal and the can be accomplished without the use of special tools or instruments.
In the case of the surplus FT-243 style of crystal, the blank may be raised in frequency up to several hundred kilohertz, if it is a fundamental-frequency cut.
YouTube video of grinding processhttp://www.youtube.com/watch?v=j7CS4A8wB1E
Crystal Grinding Without Tears
Helpful Hints on Bringing Blanks to Frequency
BY FRANCIS R. COWLES, * W1AOK
*c/o Crystal Research Laboratories, Hartford, Conn.
(From QST magazine, April 1946. pages 48-50)http://www.bliley.net/XTAL/docs/misc/XTAL_grinding/grinding.html
CRYSTAL GRINDING FT-243 Crystal Blanks
by Karl Kanalz - W8TIF © 2001http://www.electronics-tutorials.com/oscillators/crystal-grinding.htm