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  • C3 if I am correct is the clearance advised for press-fit assembly in a metal parts, that way the clearance is reduced once assembled to a more acceptable value (e.g. in idlers with metal pulley).
    If you managed to extract them with simple tool ("light" press-fit with hammer for example), I reckon the standard ones should be alright but @mdcc_tester will probably be more useful than me

  • Cheers.

    Sorry I edited my post as I read up more on them and really they only seem relevant for high rpm situations where the heat requires room for expansion.

    But now going to hold fire after what you've said about C3 being better for press fit.

    It's for this:

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