I have just changed the oil on my leg drive. In doing so I compared the notes I had made in 2002 while watching the Amel engineer in La Rochelle show me for the first time against Amel's own notes. In the Amel notes , item 2, they show the key being removed
from the prop shaft using pliers or a chisel.
I was surprised to see this, as both instruments can put a dent or a nick in the stainless key.
The Amel engineer used a simpler solution--with a rubber hammer he tapped the key on the forward end, then on the aft end, and did this about 20 times, each time just a sharp tap. ( I also give it a squirt of WD40)The effect is to gently rock the key ,
loosening it so that you can pick it out with your fingers. No damage.