Changed my tyre with my old school metal levers was, shall I say, less than helpful.
My oldie levers are ... old, I'm thinking 25 years. Metal is not the tool to go jabbing around where the tyre meets the rim. I ended up with scratches on the rim. Not good. And I also discovered that the round edge has turned into a sharpen edge. I easily punctured the tube. Double not good. Well, away they go & I brought out my plastic tyre lever stick. No more hurtin' the rim or assaulting the tube.
It's now my newbie lever!