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Lapping engine parts.

This is a cheap & dirty but also a highly effective way of lapping engine parts. 
Use a glass on a flat and rigid surface and set a silicon carbide sandpaper or fine grinding compound on top of that. The surface should be true and this is where the glass kicks in but a granite surface plate is a better choice. 

Using slight downward pressure and 8-pattern movement, the parts accommodate a flat and smooth surface finish. A smear of WD40 does help the whole process when using sandpapers or fine emery clothes.