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VOCSC list ET243 Rocker Bearing shims. My front head rockers both shift back and forth, so I assume the hole in the top is worn oval. I intended to replace both so that the rocker feed bolt would hold them in place. All three variants of rocker bearing on the VOCSC website are noted as "Oil feed oil is sized to fit the modified ET100/1 feed bolt", which is enlarged to 3/8", which may force me to locking bolts. Maybe not the worst thing to do or would the shims take care of the shifting satisfactorily?