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Where do the outter and inner shifter levers align on the shifter shaft. my inner lever won't stay in place when I tighten the bolt.
It sounds like the lever worked loose at one point and once they loosen up a little the vibration causes the splines to wear down. The easiest fix is to replace the shift lever.
The shifters align with the bolts that tighten them up. There is a groove machined in the splined shaft that accepts the bolt thereby locating the shift lever. You may be able to salvage the shifter by closing the gap by tightening the bolt while the lever is removed from the bike. You can then carefully re-cut the gap with a hack saw or the equivalent. Be sure to check the bolt - it may bottom out on the shank before the gap closes. The best remedy is to simply replace the lever. If you do replace it don't forget to chase all of the threads with a tap before you install it or you'll gall the threads for sure.