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Use two M2.5 x 6mm bolts to fix the servo onto the backplate.
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Make sure that the servo shaft is centrally aligned with the backplate.
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Insert an M5 x 20mm bolt with a needle bearing and shim.
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M5 x 20mm Bolt
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Thrust Bearing
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Shim
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On the other side of the heatsink slide on another thrust bearing.
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Begin by preparing the backplate with two M3 x 8mm bolts as shown.
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Drop an M5 nut into the back of the Backplate.
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Fix the assembly together, making sure that there is no play in the switching motion.
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The bolt should be tightened down enough to allow the heatsink to rock, but there shouldn't be any play along the axis of rotation or on the plane of contact.
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