[3DEM] 626 cryoholder pin

[Bill Tivol]

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Dear List,
	We have just had a second occurrence of breaking of the pin on our 626 
cryoholder that opens and closes the airlock on the T12.  After hearing 
of the disaster such an occurrence can cause if the holder is in the 
scope when the pin breaks, I have had all our users check the pin each 
time before using the holder, but in neither case did that inspection 
uncover the likelihood that the pin would break--the pin always looked 
normal.  Fortunately, on neither occasion was our scope damaged.  From 
now on I am planning to inspect the pin with a dissecting scope monthly 
in addition to having the users continue to inspect it at each use.
Yours,
Bill Tivol, PhD
EM Scientist and Manager
Cryo-Electron Microscopy Facility
Broad Center, Mail Code 114-96
California Institute of Technology
Pasadena CA 91125
(626) 395-8833
tivol at caltech.edu
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