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Old May 9th, 2015, 05:04   #2
Wrath144
formerly steyr
 
Join Date: Sep 2005
Location: Winnipeg, Manitoba
Not 100% sure, but my guess is that's a notch for the tool to remove them. The ones with the notch are completely round, while the one without the notch has the flattened sides which can be gripped by a wrench.
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