Any small hole attracts mud daubers, I had them fill both ends of a roll of 1/4" copper tubing one time. They are also why I keep my torch tips that aren't being used in Ziplocks. But they are not necessary to plug the exhaust on string trimmers, chainsaws, etc. Most of these come with "spark arrestors", fine screens that the Forest Service requires. I just rip 'em out. Older 2-strokers will often build up carbon deposits right in the exhaust port, to the point there's only a pinhole between the piston and the muffler. A little experience and you can tell by the sound what the problem is.
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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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