The 20A bushings are suited to Berea's Wavy Blade Letter Opener.
These are round pieces of steel that slide on the mandrel between the mounted pen blanks. You must turn the wood down to the top of these bushings to achieve the correct wood size. Each kits has specific bushings. The letter after the bushing number indicates which mandrel to use the bushing on e.g. A or B.
Picture is a representation only.
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