Question ..... with the geratherm rectal thermometers (the ones with the thick base and narrow tip), are you supposed to insert the narrow tip only, or are you supposed to insert it to the thicker base? I’ve seen videos of both methods. Just want to understand how they were intended to be used. Seems to me by inserting just the narrow tip that the thermometer wouldn’t stay in place on its own due to the size and weight of the thermometer.