Marlin 1893, loose takedown

[Shadme]

I have a Marlin 1893 in 30-30 with a 20" octagon barrel and is "takedown".
It was made in 1900 and is well worn, but shoot very straight.
Serial #205517.

The "takedown" is loose and the cam lever is so loose it does nothing to tighten the action. What can I do to tighten it?

Also, if anyone knows anything about this rifle other than the manufacture date, let me know. It appears to be unaltered.