Surface irregularities of a felt wheel will cause vibration and make accurate honing difficult.  Felt Wheels are "trued" on both sides at the factory but it is a good idea to "true" your felt wheel if you are re-installing it or if you have been using it for a long period of time.

It is a good idea to remove any surface irregularities from time to time to increase the life of a felt wheel. 

First, using a piece of bar stock or other square-edged steel item, remove any build-up of honing compound prior to "truing" the felt wheel as the compound will clog the sanding drum.

Then mount a 1/2" sanding drum fitted with a 60x sleeve in an electric hand drill.  With both the wheel and the drill spinning, bring the sanding drum against the wheel.  Make light passes following the contour of the wheel's face and sides until the wheel is no longer eccentric and is restored to the desired condition.

Check the arbor nuts on both sides of the grinder as braking action of "truing" the felt wheel might loosen them.

Always practice safety when using power tools.  Wear eye protection, masks and gloves.  Keep children away from power tools.

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