"CAMCOMPCO" wrote in
oups.com:

If I am to understand the
ballize description provided by Dan, the hardened ball bearing is
pushed through the hole, essentially smashing the bumps and scratched
flat. Now I have a reason to hunt for ball bearings on ebay.

Exactly right. Kind of a poor man's burnishing tool. Here's a guy on Ebay
that sells gage balls (cheap):

http://search.ebay.com/_W0QQsassZtoolsupplyQQhtZ-1


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Dan