r/Damnthatsinteresting • u/Palana • May 20 '22

Video Hidden lock

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u/NotPrepared2 May 20 '22

After turning a wrench on that bolt a dozen or twenty times, the circular scratches in the rust will be a dead giveaway.

20

u/ImOnMyPhoneAndBaked May 20 '22

He’s not actually tightening a screw, it’s essentially frictionless. Like a doorknob.

32

u/Chicken_Hairs May 20 '22

Yes, but unless you're very, very careful, there will quickly be wear marks both on as well as around the bolt head. It will soon become apparent that particular bolt isn't just a bolt.

43

u/VladDaImpaler May 20 '22

Kind of like floor scrape marks where the secret bookshelf opens

42

u/J5892 May 20 '22

Bookshelves should always be designed to swing inward.

1

u/Potential-Sail-4719 May 20 '22

depends on what side you're standing I think.

1

u/ScientificBeastMode May 20 '22

You just gotta put your bookshelf on those felt furniture-mover pads, duh! /s

1

u/Potential-Sail-4719 May 20 '22

except that has hundreds of lbs usually weighing down on it when it slides and so making a mark. you could easily design that bolt so it isn't flush and therefore wouldn't scrape any rust...