The wide concave screw on some reel handles can be easily removed without damage by using a penny. It also works on the clutch lever screw on the Cold Water reels. I had to use a U.S penny as Canada doesn't use pennies anymore.
Some screw design to use penny to unscrew to prevent damage to screw
Nickel fits some screws too
Does great on old rifle scopes too!
Anything is a tool if you use it wrong enough !!!! John Taylor