SAINT... Putting this together is so easy and takes about 15 minutes. I usually stir by hand with a big wooden spoon. BUT, I have adapted a hand mixer mounted on the top of my rack that holds the pot. I don't use the mixer blades but have adapted a plastic paint blade for the mixer. Works better than anything you can buy.
The most important thing in making it is drilling for the ball valve. I have it 1/16th of an inch away from the heating coils. The valve heats up and I do not usually have to ram the valve with my dowel. The heat liquifies the left over plastic in the valve and when I open the ball valve all the way...it runs out. When I am finished a job, I usually tilt the pot backwards and clear the valve anyhow. Then leave it open for the plastic (if there is any left) to cool.. SIMPLE
As I said.. I use 12 of these and they all perform FLAWLESS!