Source for metal balls

[William S. Moore]

Sharon,
One of the best sources for precision metal balls is a local bicycle shop.
 They usually carry precision ball bearings that are extremely round and
precisely machined to known dimensions.  I would check with them.  I am
evaluating an OP-100 with tomography right now also, let me know how it works
out.

Bill
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William S. Moore, DDS, MS
Dental Services Radiology Officer
Wilford Hall Medical Center
Lackland AFB, TX  78236
210-671-2343