using a cylinder and activating symmetry and radial count one side of the cylinder sculpts additive the other subtractive? See picture.
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using a cylinder and activating symmetry and radial count one side of the cylinder sculpts additive the other subtractive? See picture.

Do you have the M button (mirror) turned off in Symmetry portion of the transpose palette by any chance?
that was it. I guess I was working much too fast. Thanks