Security that is school-boy approved

found on Dump A Day

I can't help but wonder what purpose this door passcode serves other than making immature people giggle.

Making a combination slide bolt

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It's certainly sturdy, but with only 3 digits in the combination it couldn't really be called strong. A slide bolt like that would be on the inside, though, so an outside attacker wouldn't be able to access the dials until they go over the fence, however at that point it may well be simpler to just unscrew the device from the gate. 

It may be good enough, though. Mostly it's going to slow people trying to take heavy objects (ones that can't go over the fence the same way the people got in) off your property. No lock is undefeatable but if it slows them down enough that may just provide enough time for police to arrive, or it may simply demonstrate that your property isn't the easy pickings they thought it was and convince them to try some place else.

Mike Shake: This is Why Combination Locks are Completely Useless

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As far as the bike lock is concerned, I think most thieves would just use a cutting tool rather than try to actually decode the lock. This still seems like an interesting skill to learn, though, and who knows, if you're fast enough then maybe you can make decoding the lock seem legit enough that people won't question it when they see you trying to open the lock.

Turn Stainless Steel Bolts into a Pocket Safe

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Not only is it a beautiful peice of work, but in seeing how it's made we gain a better understanding of how it works.

How to crack a Dudley dial combination lock

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I've seen so much information about how to crack a Master lock, but that's not much use to us up here in Canada where Dudley reigns supreme. This video also seems to confirm what I suspected from my own failed attempts at applying non-Dudley techniques against a Dudley lock - you seemingly cannot shim them. I guess in that regard at least they're better then the Master locks as shimming is a technique I've frequently heard mentioned for quickly opening a Master lock.

Laser cut wooden combination lock

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There's nothing quite like building something with your own hands to gain a better appreciation for how it works. Watching someone else build it is pretty good too, but not quite the same.

Easy peasy kinda sleazy

from here and here (image source)

I don't know, maybe the "Army Of The Dead" character Bly Tanaka simply didn't want to divulge the combination because he reuses it for everything, but it certainly would have made their jobs easier if he'd given them that bit of info.