I'm sure this is on here somewhere but I couldn't find it: Does anyone have any tips for securing a thermowell into the neck of a 6 gallon glass carboy neck? I've had some issues with my plastic bungs but nothing like this sucker. It exits itself upwards immediately. I first tried on a carboy that I'm using for fermenting that was pretty slippery from star san. But also tried it with another carboy (same type) completely dry with the same result. This is the one I bought. Maybe I should go one size smaller?