That probe is a nightmare!! I finally just left it alone. The chicks hatched and were fine. It didn't interfere with them moving around. Some even slept on it. Of course with it lying on the floor of the bator, I had to watch the temp and adjust a little, because it's a little cooler down there and would make the heat run more. Good luck with your hatch!
Thank for your help. At the moment I have it duct taped to the side of the upper lid. It's staying for now, but not certain when I go into lockdown tonight and have to crank up the humidity if the tape will hold.