For something like this to work there needs to be tension and a tight fit. This doesn't have either. It flops around inside any jar and the bar that's supposed to set the wicks flops around inside the groves that are supposed to help guide it. The end result ends up being the wick is rarely centered. I get a better result by eyeballing it. I'll continue to use the rods as those are at least useful for holding the tab straight as long as my hand is straight. At least this gave me some ideas. I'll probably fashion something that does this as intended rather than how this one does not.