you may try this.....
slightly bend spring on ejector inwards....buff/polish the bolt side of spring
along with buff......not grind or sand the bolt's sliding surface
also very lightly smooth out the ejector sliding groove in bolt
600 grit & popsicle stick & oil....I polish the cam on lever also......
re assemble after lightly oiling and cycle action 100+ times
I like my Marlin lever guns......
http://www.rangerpointstore.com/categories/large-loop-levers-parts.html