Nice job Bob, but it's actually easier than that. All you need is a 41mag or 44mag case, well two actually. Drill both primer holes out & get some 3/8"ID tubing. Put one case under the Dillon primer plate & the other in a hole in a small plastic water bottle. I use small hose clamps to secure them, but they really aren't needed. The tubing is a snug fit. Make the tubing long or short depending on your bench setup.