I got a couple of 18-inch harrow discs, cleaned them up with angle grinder/flap wheels. Coated with pam spray and ran a chimney of coal to season the steel. Heavy (around 15 lbs) but not too heavy. They are dished about 1-1/2 inches. So they can be used as a “dome” or a “bowl” deffuser. However, I did have to trim the WSM charcoal basket so as not to interfere with the cooking grate. I still need to weld up the hole in the center of the disc. I wish it was flatter, when using as a bowl, I am limited in the amount to charcoal I can put inside the ring. But, for $15, I cannot bitch too much.