How to Reduce Bore Size of Your Saw Blade? - Woodford
However, some blades smaller than 30.48 cm diameter may still come with a 2.54 cm arbor hole or a diamond shaped one. For these blades to fit closely to arbor, reducer rings are used to fill the excess open space. Worm drive saw blades have diamond shaped arbor hole instead of regular circular shaped. These are specifically designed to meet the requirement of carpenters.
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