In simple terms, big mouth equals big, greedy shavings from softwood, while a small mouth equals fine, petite shavings from hardwood. To adjust the size of the mouth set the frog in place with the three screws, and then try-out the adjustment screw. You will sec that a clockwise nirn pushes the frog forward and makes the mouth smaller. When you have achieved a setting to suit, then tighten up the two frog screws.
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