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Posted by Chris Case [75.36.41.87] on Monday, February 11, 2013 at 00:02:14 :
In Reply to: Re: Power Wagon Trivia the Blizzard Edition posted by Don Evans [166.216.226.171] on Sunday, February 10, 2013 at 23:51:58 :
It spreads the lips of the cups to ensure a good seal.
They've been superseded by winding a flare into the ends of the springs.