Mine came off easy, but only because I have the engine out of course...
Some people reported seized CHT and of course there is limited room to work on them in situ. Since yours was turning you are better off than most but sill proceed with caution. Try drilling a small hole and use an easy out if you can find the room.
__________________
Gilles & Kathy
Happiness is not having a Porsche in the garage... Happiness is having a Porsche on the road!
86 Porsche 911 Cabriolet, 2011 BMW 1200RT, 03 Saab 93 Cabriolet, 06 MB E350 Estate