Acquainting yourself with the KitchenAid stand mixer.
I remember my first KitchenAid stand mixer, a silver Professional 600. I got it before I went into appliance repair, and it had a broken lift mechanism. I was able to learn how the parts worked with each other and found out which parts needed replacement and repaired the mixer. See, this mixer was tossed out. Someone decided it wouldn't be worth fixing and departed with the mixer's company. I fixed it and had a $400 mixer for less than a quarter of that. I didn't know th