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Viking Arm is a Norwegian company that has designed an eponymous tool for installers of doors, windows, cabinets, flooring, porches and decks. It features a thin set of jaws that can be used for lifting, pressing and tightening.
It's essentially a twist on the trigger-style clamps you see at the home centers, just built heavier-duty. And like those clamps, it can be disassembled and reversed:
Made from stainless steel and aluminum, the tool weighs 1.4kg (3 pounds) and can lift 150kg (330 pounds). There are a lot of demonstrations of use cases (like the one below) here.
Manufactured in Norway, the Viking Arm has a list of international distributors here.
Lastly, for a simpler tool with some overlap in functionality, check out these air shims.
I’m a lapsed industrial designer. I was born in NYC and figured I’d die there, but a few years ago I abandoned New York to live on a farm in the countryside with my wife. We have six dogs.
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Specialty Tool Design: The Viking Arm for Lifting, Pressing, Tightening and Spreading
Or you can invest in a Door Stud if you want something that actually stands a snowball's chance in hell of being able to keep a door upright as you maneuver it toward the jamb.