When diecutting shapes, a metal jacket is used on the platen instead of oiled tympan paper. This protects the press from the sharp cutting edges of a die. To coax the jacket and its springy clips into place, sometimes we use a mighty “32 oz Rubber Mallet” to tap it into place. Tap, tap with the mallet’s wide surface area and the jacket is locked in and ready to start getting in position. Wielding this 32oz rubber mallet makes me feel like Thor.