how to tell bad bearings

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Offline bbb

how to tell bad bearings
« on: April 19, 2011, 12:38:51 AM »
i cleaned my split bearings on a brown marble.  How can you tell when they should be replaced?  they have some wear where the rod slides back and forth.  when i say wear, i mean the texture is no longer smooth finish, grayish instead of black.  does that constitute a change?  or would a brand new bearing look like that after a few plays?  how do you know when they need replaced?  thanks