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To the layman, it’s the propeller-shaped doodad the chain rides around in a chain saw. To the lumberjack, it’s the guide bar. Whatever you call them, they’re one of the city’s hottest new products.

When a chainsaw is running on point, it will effortlessly buzz through a piece of timber while the operator gently guides it in the desired direction. This is very pleasing indeed. But get a little ...