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Old 03-26-2012, 09:30 AM   #15
Beastly Adventurer
Joined: Sep 2008
Oddometer: 1,078
The hole that gets drilled out is a casting where the outer part is already 12mm, the casting is hour glass shaped so you are only removing a bit of a rough casting in the center of the hole. You would really have to try hard to not get it right.
Jay G
DMC sidecars
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