Hi Norm, I just remove the rough edges with sandpaper on a round tool.
I run a round file over the piston to get big lugs off......
I have swapped really thin rings for thicker ones, all way out of specs.....
But some of them go and mow lawns.............
I'm not spending $40 and getting it running much better and selling it for $50............
I put new O-rings and gaskets and carb parts .......... refile points, blow clean airfilters
Mine is a home bush workshop....... not a trade shop.
We don't have kerbside cleanups up here................
cheers
speedy
