Trapping oil is something I had not thought about and the light sanding would not scar the piston walls.

As for manual machinist, seems like there are less and less of us.
But, just do a search on manual machinist wanted, and some shops can't find any.
Ask John Lucas. He owns a job shop in Omaha.

Don

1967 GMC 9500 Fire Ladder Truck
"The Flag Pole"
In the Stovebolt Gallery
1946 2-Ton grain truck
1946 3/4-ton pickup,
1953 1-ton pickup
1957 1-ton flatbed dually,
1954 Pontiac Straight Eight
Of all the things I've lost in my life, I miss my mind the most!