hi my name is preston verrine i’am a member of ladies of letterpress i have that part you are looking for it;s call a bale shutter. keeps the packing from sliping do you still need one take a closeup picture of the board they make 3 different models for 10×15 platen presses c&p kluges,vandercooks etc.or call 202-436-4432 i can ship it to you