Thanks so much for all the replies candlers. Perhaps I am trying to be a little too perfect. It’s just that the flicker, at least to me, does not seem to be caused by a draft. It is more like a very rapid sputter but only for a second or two and then back to a normal flame. I think Alan might have given me the answer in the fact that transient interruptions of oxygen flow could be the cause. But I wonder if there is a way to prevent this? OH well, I’ll just keep trying. Thanks again for all your advise. In return I would like to offer some advice for others. If you live where it’s warm, be thankful and don’t come to Michigan. We had 16 inches of snow the other night and it was down to 16 below actual. It was cold enough to freeze your candles. Carry on.