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Centers a tube within another tube.
Center a BT-5 size tube within a BT-20.
Center a BT-20 size tube within a BT-55.
Center a BT-20 size tube within a BT-50.
Center a BT-50 size tube within a BT-55.
Center a BT-50 size tube within a BT-60.
Center a BT-20 size tube within a BT-60.