Hottie a free turbine has a lot of hot wind blows on the windmill thingy attached to the kepellor geer box.
The other ones geerbox is fixed to the hot windmill thingy in the hot part and is connected directly to the kepellor. None of this should be touched or altered by a pilot.Some times its not a bad idea to cover the EGT thingy when yer startin with a flat battery.
Hope this clears it up for you.
Your pal.