In reply to Drew_boy:
I've just done the same thing with mine, but I'm amazed how blunt they have become. I've got a mix of turbos and 360's and both seem to be suffering somewhat.
I've actually just replaced a lost express screw and was quite shocked how blunt my existing screws have become. I thought I'd done a pretty good job sharpening them them until I compared them to my new screw.
My existing screws are also now much harder to place than they used to be, regardless of having had them sharpened by an ice screw shapening service and also doing it myself.
Which leads me to the question of How many seasons should an ice screw last which average usage? Some of my existing ones are now probably on there 10th+ season. (some 13th I think). Should they be replaced?