Cissy, Like you, I am picky about having my wicks centered on top and on the bottom of the jar. I use something like this that I made out of cardboard: http://www.ezwicksystem.com/default.asp?S=503&A=E&PKV=WICK-28|0 I made some myself because I don't use jelly jars. I made them using a Fiskars circular cutter and punched lots of holes around. After the candle is poured, I slide the circle down, pull a little (just enough to make the wick taut), and secure it with a clothespin. As long as the edge of the cardboard is flush with the top edge of the glass, the wick should be centered.