I did this. Peeled back the uth put the probe in and the damn uth would not stay around the probe. There is a huge air bubble and now the uth is useless. So Taylor (Ttaylorr) suggested styrofoam. I don't know how to link but she drew me a picture in my thread. So basically leave your uth against the glass. Then You make a channel in the styrofoam for the probe and that goes against the uth. You will need another piece on the other side so your tanks sits on the foam pieces. Does that make sense? I wish I could link my thread here.