The insertion gauge (20) of rectangular cross-section includes, on its lower part, a flat (straight) surface (29) joined to a rounded edge (30). A bore (32), closed off at one of its ends and connected to a fluid source at its other end, is connected to atmosphere via channels (33) so as to create a flow of fluid between a cut-out being inserted and the next cut-out of a stack of cut-outs to be inserted into a machine operating on them. IMAGE
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