I've just tried to open one of these ring-pull cans with the Lakeland gizmo as my poor old arthritic fingers can't do it any other way, and the ring shot off with the speed of a bullet, clipped my swollen joint en route and hit the window before vanishing into the great unknown. I then tried, with throbbing finger, to use the electric can opener, but it just sneered at the unconventional rim, so OH attacked the can with a screwdriver and I finally got at the prunes! Oh for the old style cans. At least I then had the measure of the enemy.