I've got many Ark stones Valentine. And a few tri kits of both Ark and Diam. The problem I was having was holding a consistent angle anymore. Just can't do it as well as I used to. Makes for a wavy edge and not a very stable one.
CI, I'm running into some difficulty with my longer Filet and Chefs knives. They keep moving in the clamp. I can hold the handle when doing one side but when I flip it I either have to switch to left handed to do the stone and hold the handle or it moves in the clamp. And yeah it's tight! Just can't seem to get it tight enough to hold the blade stable. When I get out closer to the tip it pushes the blade. Maybe Flags or Rock will chime in with a solution to this little problem with a solve? Any tighter and I'll break the tension screw!