If you have an inexpensive Lee universal expander, you could consider making m-style expanders for it instead of the Lyman body. Places like NOE molds and Track of the Wolf have pictures of and sell expanders for the Lee die body. Maybe, an easier project since you don't have to internal thread and keep the outside concentric. They are so basic, but inexpensive at totw that a person might just start with an oversized one instead of round bar stock. Once you setup to make the expanders for either die body, you might make extras a thousanth over and under sized to tweak you loads if the neck tension changes for a bunch of possible reasons. Best of luck with it.
edit to add, I noticed Mike's comment, and I thinks it's spot on for making that style of expander, create a jig that's quick and easy to true to hold your work.
Last edited by craigd; 03/08/18 06:28 PM.
