A knurling tool is applied to the piston, as it is held in the chuck of a lathe. The tool knurls, which means raises the surface of about 50 % of the surface of the piston. A knurled surface is like that of a brass handled screwdriver, you know, the ones that have 7 screw drivers, each threading into the next larger screwdriver, and the biggest threading into the handle of a hammer. If I didn't explain it right, Google Knurl, or knurling tool. The idea is to expand out the diameter of a worn out piston, a frequent "cheat" in days of old.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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