it is an apparatus (100) for forming a base profile in a metal container transported in a punch that moves along a geometric axis. the apparatus comprises a matrix (105) to form the base profile in the container and a flexible support for holding the matrix (105) in a resting position substantially along said geometric axis while allowing the matrix (105) to be deflected perpendicularly to said geometric axis and provide a restoring force to return the matrix (105) to the rest position.
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