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Mori MS1250 spindle bearing preload?

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Hi everyone,
Can anyone tell me the proper procedure for setting the preload on the spindle bearings on my Mori? I've heard everything from "hand-tight, then a couple good whacks on the hook-spanner with a brass hammer" to "put a chuck on it (they didn't say what size...), give it a spin and it should make 1.5 revolutions"... Neither sounded very good. Hoping you guys could help.
Thanks a bunch,
James

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