Been there and done that a number of times. Totally solved it. Tighten it.
Seriously though. What I like to do is, make sure I’m using the same indentions from the previous use, tighten it down really really good, use lock-tight, and voila.. presto.
The next time you have to remove the axle, clean the spot with a file and then when you re-assemble, hit the same exact spot again, and tighten, tighten, tighten, with lock-tight.
Done. Don’t be afraid to indent the axle, in fact, it helps keep it in place.
"Karting Expert Since 2015"