What is wrong with this lock??

[zeepia]

Bought this cheap euro cylinder lock today and picked it open. Then I noticed it has quite a similar keyway to Elzett and tried that Elzett blank into that cylinder.

And when I pull the blank out and twist it, the lock opens. WTF? It has something to do with this lock being so piece of crap but hey guys anyway! I just earlier wondered if someone is really securing their home with these locks. And they can be opened with a BLANK? It´s not just one time miracle, it´s repeatable.

http://i1138.photobucket.com/albums/n535/Zeepia/Lock%20picking/Budgetcylinderandblank_zpsa5258ced.mp4

And here is one photo of the original key and blank. It´s not very difficult cutting but they are not at the same height.



So my question is: what is happening inside this lock and have you noticed same before?

[Altashot]

My guess is that if you apply light turning pressure while
pulling the blank out, the top pins rest at the shear line.
It is a bit like shimming without a shim.
I think that this lock maybe poor quality.
Have you tried to rekey it and see if it is repeatable with a different pin arrangement?

Max

[minifhncc]

Perhaps the blank is acting like a comb pick due to poor design of shear lines. But I could be wrong.

[femurat]

What Altashot said. This is called reverse picking.
There was a similar issue with an abus bicycle lock: insert blank, apply turning pressure, slowly extract the blank... Open!

Cheers

[Solomon]

Perhaps the blank is acting like a comb pick due to poor design of shear lines. But I could be wrong.

A blank wouldn't push the pin stacks far enough to comb it.

I'm with femurat, it's being reverse picked... really crappy tolerances are to blame for this, you'll probably find if you push the pins as deep as they'll go under fairly heavy tension you'll be able to drop the pins down individually by slowly releasing tension and pulsating as each one clicks into place to open it. I've never managed this on anything other than single sided wafer locks, but it definitely can be done. I'd say this lock would rake open almost instantly with a half diamond and very light tension too. Should also be super easy to SPP. Add this one to the confidence lock pile for sure!

[atticRR]

+1 for the confidence lock pile!

[zeepia]

After picking it a lot more I found that it is easy to both rake and spp.

But I don´t apply tension when pulling the blank out. Also I hear that pins click individually when I slowly pull the blank. This method is working both ways, pins up or downwards. I find it more amazing when pins are downwards and still opening like this.

@Altashot: It can´t be rekeyed without drilling the pins open. Which I don´t bother to do.

This was my first lock that acts like this, it´s actually quite fun lock to pick So +1 also from me to confidence lock pile!

And thanks for the explanations!