Not uncommon for the ends of the shafts to be slightly egg shaped. A little quick work with a fine file will remedy the problem. I've banana cut stock shafts with a thin cut-off wheel. Then polished them. It's always worked well. If the bores of the rockers aren't to beat up? A wheel cylinder hone will clean them up. A few grooves won't matter as long as there aren't any high spots.
Doug
Doug