I've got a commerical 2.5 Lyman "All Weather" with a "post and wire". I have access to a Lyman TP which belongs to a serious Enfield collector friend. I'll do a visual comparison of the two to see if there is a difference. Then I'll attempt to determine the OD dimension to different guage standard wire. I did a quick internet search and see various shapes and diameters needles are available. Got to start somewhere......would be great if there was a drawing available. Ron.