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Porsche used the ball bearing because it was the cheapest way to control radial and longitudinal loads. It killed two birds with one stone, and found them in a class action suit.
The dual row IMSB has TWO thrust control surfaces to assist with those longitudinal loads and that is a very welcome aspect of the dual row design. Two rows have proven to be better than one.
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Jake Raby/www.flat6innovations.com
IMS Solution/ Faultless Tool Inventor
US Patent 8,992,089 &
US Patent 9,416,697
Developer of The IMS Retrofit Procedure- M96/ M97 Specialist
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