I posted a web page on this work where I show how I measured the cylinders and pistons to determine the piston-cylinder clearance, the cylinder taper and cylinder ovality. I honed/deglazed the cylinders and installed new rings grinding the ends to set the gaps to the correct specifications.
The measurements didn’t alarm me so I saw no need to bore out the cylinders and replace the pistons. I did use one over size rings to compensate for the cylinder wear and ground the ends down to the specified ring end gap.
Here are a few of the pictures included in the web page write up.
Zeroing Micrometer with 3 inch Reference
Bore Gauge with Dial Indicator
Setting Bore Gauge to Known Distance
Measuring Cylinder Bore Diameter
Wear Pattern Showing Minor Ridge & Polished Section of Bore
Inserting Hone in Cylinder
Positioning Ring for Grinding Gap
Measuring Ring End Gap