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The contact wheel's arm has a threaded hole on it, so when it's attached we put the bolt through the large unthreaded hole and into the threaded hole on the arm. There are four large unthreaded holes so that you can stick the contact wheel at four different heights.
I am not sure where the bearings are on the contact wheel, I will have to go look.
Updated to add:
Took a look at it last night, the bearings are on the wheel, not the arm.
Last edited by gandalf23; 10-12-2006 at 09:53 AM.
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