I have the same thoughts about people tossing in a tealight and not centering, even though I have it spelled out on my warning. I think it was Dee, might be wrong, but she was putting a small piece of tile in the bottom, while the wax was still soft. Thought it was a good idea, but never did try it. I made these for each table at my daughters wedding, I put a piece of cork in the bottom (very think piece of cork) and used a votive, burned for about 7 hours and I had many where the cork was melted to the wax, couldn't get it out, and a few that had melted wax on the sides. I didn't care, it was for my own use, but people out there just don't read, they will burn them all night. I only use tealights with mine, and suggest using only tealights. I give them a glass tealight holder with a 6 pack of tealights, hoping they will actually use the tealights.