250 98 KX 250 transmission how to install properly

I had an old KX that was my first time to split the cases, didn’t Loctite a screw, it came out and destroyed everything. Next one I did, after that one was fixed, was a buddies little brothers KX 80. . That one I put it all together, without a manual, and ended up missing a gear and didn’t even know it. Started up, takeoff in first, click nothing , click then third was OK
 
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