Bubbles in Thermometers

I just tried the glycerol technique to fix a load of thermometers with bubbles, most were fixed but two exploded in the beaker! You definitely need to go slowly and keep a close eye.
Put the bulb end of the thermometer in a large bung and then bang the bung vertically up and down on the desk repeatedly (or put the whole thing in a measuring cylinder with a bung in the top as a lid and shake vigorously) and your bubbles will magically disappear!
I had quite a few that just wouldn't respond to other methods. This worked a treat! Thank you!