My Stainless Steel Temperature Probe won't fit snugly in a rubber stopper hole.

The standard hole size in regular stoppers is larger than the diameter of the Stainless Steel Temperature Probe. One solution is to drill your own holes in a solid rubber stopper. Use a drill bit with the same diameter as the Temperature Probe for a snug fit. Be careful to clamp the stopper in place below the drill bit. Note: A cork borer could be used, but it's difficult to do.