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Use mushroom formers with urethane in containers to enhance their efficiency while using less force. Heavy welded mushroom formers require the master holder and are designed to be suitable for use in any Bonny Doon press. Sizes are expressed in punch diameter and dome radius (see tip below). Use urethanes with the same diameter as the former. All have 1" shanks.
Tip: To see the curvature created by a mushroom former, open a compass to the former’s radius size and use it to draw an arc on paper. The arc will show you the curvature of that former.
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