The heater is stuck behind the secondary mirror. They fit all 6 ", 8" and 10 "RC telescopes.
The fogging of mirrors fishing is best prevented by a dew and a secondary mirror heating. The annular heater is adhered to the back of the secondary mirror and heats these moderately from the rear.
A split flexible ring allows for easy and quick installation. The heating sleeve is simply stuck with double sided tape or a few drops of silicone rubber on the back of the secondary mirror. The back of the heater is already isolated ready, so that the heat energy travels only towards the secondary mirror. This heating of the air and associated tube-seeing are best prevented.
The lead may be passed over an arm of the secondary mirror spider what disturbing diffraction phenomena reduced. The attachment may be by electrical tape.