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so i called MSD and they made a very good point. i tested the cap and rotor on the old opti. what probably happened was that either the rotor hitting one of the contacts made the bearings fail or the bearings failed and made the rotor hit the contact. i assembled it exactly the way i had it before with the new opti and spun it by hand with no contact issues. he did recommend that i use the square o-ring as it will provide a better seal
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