Putting my thinking cap on-- yes, it's tinfoil too, but pointy to encourage the brainwaves to concentrate-- what are we seeing here? Is this a QC problem in manufacturing the MTs? Roxy has 1 bad out of 4, I have one that won't behave out of 3, ditto Gcc. I note, on #3, the fit of the AFC ring is much sloppier than on the others.