There are a lot of us loaders out there using a Dillon 1050, Super 1050 or 1100. The Dillon OEM toolheads are cast iron and the station over the priming station is not threaded. With the advent of autodrives and motorize loading there has become a need for toolheads with all stations threaded 7/8 14.There have been several aftermarket CNC 1050 toolhead manufactures. Some have come and gone. Let me say one of those companies On Point MFG a division of Fast Brass has once again started making aftermarket CNC toolheads for Dillon 1050 style machines. Look them up Mike and Sean are great guys to deal with.