I made mine. Worked like a charm. Took a solid steel rod about 1/4 in diameter and ground it two sides flat like a flat head screw driver. Then I took a piece of short round tube that barely fit over the oil pump shaft and left the rod I made about 1/8 inside the round tube. Then I took two washers and put inside the round tube to center it on the rod and just tacked it all together. Can post pics if needed but that's how I made mine.
Just curious, what kind of oil pressure can you make when running the pump off the drill? I'd definitely like to find any leaks before I drop the engine back into the car.