If I make a cylinder that I want to fit inside a bore, and this is not specifically about pistons in blocks , just generally speaking, with my cylindrical rod in the lathe I use a file or sandpaper to clean up the outside diameter of the cylinder prior to attempting a press fit ......but if I have just used an internal boring bar to make a hole , how do I improve , smooth or polish the inside when it’s tricky to see or get in there ? I’m not stupid enough to stick a finger wrapped in sandpaper inside the bore. I’m aware I’ll just get my finger ripped off or broken. I have a very healthy respect for the torque of the machine


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