On the Corbin walnut press I have the ram already has 7/8 thread and the opening is so tall that the piece I added on to 7/8 die part, for slip in holders doesn't have to be short, can extend up couple inches, and as well for heavy swaging on bmg cases I extended the 7/8 length on a bmg screw in die, so I can use the shorter linkage holes for more leverage and power..Ed