I would say first of all if you do not feel comfortable, DO NOT PULL IT! That being said, I am a meterman and have pulled several meters just like this. The glass cover has either a metal or plastic sealing ring on the base of it. Sometimes the ears on the cover break off when the meter has been in for several years. If I were to come across this meter, what I would do is this. First, put the cover back on the meter. (It turns in a clockwise direction). Then, for this particular meter base you should try to gently rock the meter from left to right. Note, you are not trying to pull it out at this point what I want you to do is listen. If you hear a lot of cracking, stop, the blocks inside the base are probably broken. If you do not hear this, proceed with caution and take a flat blade screwdriver and place just the blade between the top of the meter and the meter base. Twist the screwdriver like your are turning a screw and this should get the meter started. You should be able to pull it out at this point. Again, if you do not feel comfortable call the power company.