Technically , there IS a GAP .

Thisis whatyou need , more or less .
But Coles here Steak knife sets , are good for opening cans of beans and other things .
One Ea Side , tapping in evenly ,

or just go around with one . Heat & Gloves .
You cout ding / put a stress raiser on a unhardened crank with a knife / chisel edge & hammer .
Support the thing so you NOT bending it . I.E. a piece of hardwood under shaft so it sits flat on the bench while you abuse it .