If any one is interested I use a wheel cylinder hone welded to a piece of 1/4″ round stock 6″ long also weld the stone things to the arm’s so its easy to get them out of the jug. The first one I made I used a paddle drill extension it has 2 set screws to hold it on.It lasted 8 or 9 years and you can mix a jug in about 60 seconds. You might be able to Gorilla glue the stones to the arms don’t no about that.