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Better yet:
Mike N.
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
Sent: Saturday, January 07, 2017 12:33 AM
To: Homebrew PCBs
Subject: [Homebrew_PCBs] How to mark a gear to cut teeth ....any size
How to mark a gear to cut teeth ....any size... any number of teeth
http://www.learnmorsecode.com/gears/index.html