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The tops of the new cylinders I got for my Beetle's engine still had machining marks; since those form the all-important metal to metal cumbustion chamber seal, I decided to sand the surfaces smooth before proceeding with the assembly.
Here's my setup. A marble tile to provide a flat surface to sand on.
On the left is a cylinder as delivered, on the right after sanding it down to 600 grit sandpaper.
The next step will be to clean and dry the cylinders and paint them so they're ready for engine assembly over the weekend.