Buick Grand National Steering Box Build - Straight Arrow
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The piston assembly consists of a worm (inner) and nut (outer) separated by a trail of ball bearings that create a rolling screw-like thread. Valenzuela installed oversized ball bearings so the worm has a slight preload when it's turned. Note that oversized ball bearings are sized in 0.0001 increments, so it's obvious that precision clearances are important for the gear to work properly. View Related Article
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