Scratch & Dent Knuckle Bender

Does this work on exterior door condo hinges? (20mm - 3/4" bore) door hinge with spring load?

It’s certainly possible. It’s strictly a function of being able to bend one knuckle at a time when they’re bigger and thicker they don’t bend is easy.

I wish the jaws were rubber-coated. Seems easy to scar up the metal hinges.

Great idea. We will consider it when we do another redesign! If you are worried about the hinge though, a simple shop cloth between the tool and the door works great!

Seems like any door that's near a corner this tool will not work when the knuckles need to be bent towards the wall.

In this situation you should be able to remove the door and bend the knuckles on the door part of the hinge rather than the frame part, then reinstall the door. That’s what I had to do in my house.