By loosening the screw on the cutter head and rotating it so one cutter wheel is perfectly centered on the bottom, it does cut. So the DUH is on me. I misunderstood how the head works. Double duh. Wish that tidbit was on the instruction sheet for us dummies. I've not used it on rough or tough glass yet.FIRST REVIEW: I just got this and am trying to cut a circle. The blade doesn't even touch the glass. The meager instructions do not mention this. If anybody can tell me how to fix this, I will change my review. Until then, this equipment is useless.
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