Primer drop tubes attach to the spent primer cup.
To determine which press you have, Co-Ax Press B1, B2, B3 (5/16" diameter) tube will have either Bonanza stamped on the frame casting, or under the vertical Forster there will be a patent number.
Co-Ax Press B4, B5 (3/8" diameter) will have MADE IN THE USA stamped under the vertical Forster.

SKU FORPRIDT
Brand Forster

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