today i'm going to show you how to
crack one of these um combination lock
this is a key safe that belonged to a
colleague of mine who
inadvertently change the combination and
he doesn't remember what it is
so i told him i would try to
crack it open for him so
all you need is a few pieces of
paper um that's thin enough
to slice through
the slides down this gap here
but it has to be strong enough that it
doesn't collapse as you slide it down
the whole idea is these four
these four dials
underneath and they look like this
they're not the the barrel or the
cylinder
isn't um a full circle
there's there's one part that's going to
be flat
so the idea is that we we find
where this flat piece is on
these four dials so what we'll do is
um we'll put the paper down
the gap here and as we're turning
the paper will stay pretty pretty um
in position but as you turn it and it
gets to
where it's flat you feel that the paper
will just
dip down and that's where you know
um where this line is so once you've
lined up
all four of these things
in once you've lined it all up or this
this
flat line once it's all lined up you
know that that's
the correct positions for the numbers
so let's have a go
what i've done is i've taken this piece
of paper i've
put it down the gap
here and i've drawn a line
i've drawn this this line to show
um where the position is so where it's
sitting
so what i'll do now is i'll just turn
this
digit one at a time and when
that piece of paper or when i turn this
to where the cylinder is flattened out
the paper should drop
so as i'm turning i'm just pushing the
paper
very slow very slightly just pushing it
down
all right so that's a definite drop
there so if i just
push push it again that lines you can
you see that lines going up
and that's going down so for this
particular digit
i found where the cylinder is
flattened out so we're here
all we have to do is now repeat the
process on each of these
numbers so here we go
oh this is right there this is low so
what i'll do
i should show you i'll turn it see the
paper get pushed up
so there okay so i've got these two
lined up now
so
let's see
i keep turning
oh i think that's there so
let's put some paper down
there's a drop there
push it out see that that goes up
so that means there's a digit there
okay let's go to the next one
looks like this paper is about to give
up so let's turn it around
use a fresh corner so let's make a mark
i'll make a mark
and we'll turn the numbers
i think that's there because let's just
drop down let's keep turning and see if
it'll get pushed up
yep see it's gone up
that's where it's dropped so
so what i've done is i've found i've
lined up
the barrels so the flat part is all here
now
the flat part is on lined up along here
so we'll try to open it if that doesn't
open
it just means that um the
this flat part is not in the right
position
on the opposite side so if i turn
this five times one two
three four five the same thing on the
next digit
one two three four
five same one two three
four five one
two three four four five
okay so all that i've done is
i've turned the flat part of the barrel
to to the opposite side so it's back
here now so
let's see if these are open and
it opens
there you go hope that helps someone
thanks for watching