i have to commercial gas dryers that are not getting hot i have changed out the thermostats, thermister, igniter, sail switch and i have checked the solenoids i'm on to removing the flame sensor but the screw is stuck and i cant get it out no matter what i do i'm not sure what it could be if its not that any help would be amazing. Its a large commercial Maytag dryer. or if you know hot to get a screw out of metal in a very tight spot.