Before you go and pull the shaft measure it first. I've had this issue with a new clutch. Measure the shaft as the clutch bore is likely to wear as opposed to the shaft which is hardened. i recently installed a new clutch and had .002 clearance from the on a standard size shaft and would wobble. I cured it with .001 stainless steel shim stock wrapped around the shaft. I made a rectangular hole for the key to keep the shim in place.