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The temps seemed a tad ‘mild’, so I thought I’d try to fashion a shorter spacer ring, allowing the heat source to rest closer to the beans. A trip to Home Depot led to an aluminum strip purchase. The strip is 1.5 inches, cutting the spacer height in half, and bringing the roast times right into zone. Unfortunately, this aluminum strip is killer thick – so thick, in fact, that I had a bear bending it into the round shape needed. I fought this problem with various kitchen pots & clamps, bending, clamping, and bending more until it matched the UFO’s diameter – not a recommended thing – find thinner metal. Instead of running a red goop bead on this new ring, I bought a length of high-temp silicone tubing from US Plastics (3/16" ID x 5/16" OD). It was 60 cents per foot, available in 10 ft. increments. A slit with scissors made for a quick fit. The turbo oven sits firmly & does not move – nice.