If you can clamp your run out gauge (clock dial type micrometer) on your case and slowly check the crankshaft movement, then try and mark the spot if it is the same, after a few revolutions with a dry type marker pen. Then try and move the gauge to read at a different point on the same side of the crankshaft and see if it is the same. Then try and check the flywheel side and see if there is any up and down or wobble at the same point on that side of the crankshaft. The crank on the output or clutch side takes the most abuse and has the most stress, so that is where there may be some normal wobble. If it is a consistent spot it may be counteracted by the clutch when it engages in the drum and most likely will not be very noticeable, or cause any severe engine damage. The clutch itself is not a high precision part, the shoe,and the drum both wear to odd shapes and wear patterns that are usually not at all noticeable when there is a load on the bar and chain which quells the vibration at the end of the crank. If this was a old saw of yours, did it have a huge amount of vibration before, and are the bearings in good or new condition. Unless there is a huge wobble on the other side of the crank this may not be to noticeable at all.
