We have developed this self-centering for jars that are 2 1/2" and up in diameter. The sample can be slipped over and assembly just so you can see if it fits in the bottom of your glass. We thought it woud be easier to do a quick test that way. These are available in assemblies once you have determined the right wick for your candles. Thank you for ALL of your support. Looking forward to hear from all of you soon. Joe WICK IT