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Simple Master M175 Decoding

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Robotnik

Familiar Face

Posts: 147

Joined: Sat Nov 29, 2014 8:01 pm

Location: Oregon

Post Thu Sep 17, 2015 4:01 am

Simple Master M175 Decoding

Image

Unlike its less robust cousin, the newer Master M175s don't fall as readily to the same simple, YouTube-famous bypass as the 175.

Decoding with a feeler gauge is not impossible, but harder than your average wheel combo padlock.

Considering the above, I started looking for an additional method of nondestructively opening these locks. With many simple wheel combination padlock and cable locks, shackle or cable tension while manipulating the binding wheels in turn will cause the correct gate to 'bite', eventually allowing the lock to be opened once the correct 3- or 4-number combination is devised.

No bites. This wasn't going to be quite that easy. Tensioned the shackle, and kept going.

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After a lot of spinning and combo resets, I noticed a pattern. With shackle tension applied, each number on a lightly binding wheel could be moved through a certain range. With non-combo numbers, moving the wheel upward causes it to stop right about here (keep your eyes on the third wheel):

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Once you land on the combo number (8, in this case), however, the upward movement can go a little higher, like so (again looking at the third wheel):

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Basically, you're looking for additional few millimeters of play in the wheel once you've hit the true gate. After hitting the first number, move on to the next wheel (in this case, the second).

Nope…
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Yep...
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Nine it is. Keep going until you reach the last wheel, and…

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Boom.

On one lock I tried, the far right wheel bound so hard it could barely be moved under tension. With that being the case, I simply set the other three wheels, then cycled through the ten possibilities on the wheel until it opened. It's not foolproof method, and does require a fair bit of finesse. Some locks are touchier than others, I've found.

Should anyone need to recover a combination to one of these, hope this helps. Haven't seen this specific method demonstrated before, but I'd be extremely surprised if I'm the first to come up with it. Doesn't appear to have been described on the Forum before, at any rate.
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GWiens2001

User avatar

Lock-Goblin-Gordon
Lock-Goblin-Gordon

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Location: Arizona, United States

Post Thu Sep 17, 2015 4:05 am

Re: Simple Master M175 Decoding

As I posted on your post elsewhere, it works on the ProSeries 1175, too.

Image

Fantastic work, Robotnik. :D

Gordon
Just when you think you've learned it all, that is when you find you haven't learned anything yet.
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Riyame

Keeper of the Bests / Supreme Overlord of Small Format Interchangeable Picking Nightmares

Posts: 1936

Joined: Sun Jul 24, 2011 5:16 pm

Location: Canada

Post Thu Sep 17, 2015 4:22 am

Re: Simple Master M175 Decoding

HOREE SHEEEET!

I just popped the M175 that anarchy_won sent me a while back. Amazing find good sir! Time to sticky this thread.
PhoneMan: I always knew I'd say something stupid and it would be someone's sig
macgng: i am an equal opportunity pervert
macgng: aww fuck thats goin in someone sig :-(

If life gives you melons, you might be dyslexic.
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Anarchy_won

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Active Member

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Location: Ontario, Canada

Post Thu Sep 17, 2015 5:00 am

Re: Simple Master M175 Decoding

:-) I have been working on a similar method, but was having less then 70% success in opening them in under 20min
(17:44:28) HAL 9000 Sez: LockSport is full of children who throw fits because low priced low security products sold in discount department stores do not meet their arbitrary expectations.
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GWiens2001

User avatar

Lock-Goblin-Gordon
Lock-Goblin-Gordon

Posts: 3413

Joined: Fri Oct 26, 2012 3:05 am

Location: Arizona, United States

Post Sat Sep 19, 2015 10:08 pm

Re: Simple Master M175 Decoding

It works on the block-style ones at Ace Hardware, too. :twisted:

Image

Will say that the ProSeries version does have tighter tolerances as far as how the wheel turns. The non-ProSeries ones have about twice as much extra play, both in the correct number and in the incorrect number. The difference is very noticeable.

Thought it was just the camera angle or something when Robotnik's numbers went all the way to the mid-number line at the correct number, while my PS version only went half way to the same spot. This non-PS one at Ace turned just as far as Robotnik's pics show. And the PS ones only go as far as the ones in my pics.

So be aware of the difference if you are trying out different ones.

Gordon
Just when you think you've learned it all, that is when you find you haven't learned anything yet.
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Oldfast

User avatar

OldddffAASSTT the Spin Master Extraordinaire and American Lock Slayer
OldddffAASSTT the Spin Master Extraordinaire and American Lock Slayer

Posts: 3990

Joined: Thu Mar 31, 2011 3:16 pm

Location: Michigan

Post Sun Sep 20, 2015 2:04 am

Re: Simple Master M175 Decoding

I love shit like this. Great work! Thanks for sharing it.

Can't wait to give this a try. Gotta get a few of em' first.
" Enjoy the journey AS MUCH as the destination."
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GWiens2001

User avatar

Lock-Goblin-Gordon
Lock-Goblin-Gordon

Posts: 3413

Joined: Fri Oct 26, 2012 3:05 am

Location: Arizona, United States

Post Sun Sep 20, 2015 3:44 am

Re: Simple Master M175 Decoding

Oldfast wrote:I love shit like this. Great work! Thanks for sharing it.

Can't wait to give this a try. Gotta get a few of em' first.


Don't bother! Go to Ace Hardware, Lowes, or some other hardware store. Was waiting in line at Ace Hardware and the locks were near their paint department where I was waiting. So I grabbed the one in the above picture, and voila! Instant testing. Was even nice enough to put it back on the hook with the combination entered for their convenience. :mrgreen:

Gordon
Just when you think you've learned it all, that is when you find you haven't learned anything yet.
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NKT

Newbie

Posts: 6

Joined: Wed Apr 23, 2014 8:01 pm

Location: UK

Post Wed Mar 15, 2017 8:13 pm

Re: Simple Master M175 Decoding

Very nice. I've played with this lock in the UK. Had noticed that there was a slight difference, but this is a good clear explanation.
Thanks!
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tarboxb

Familiar Face

Posts: 152

Joined: Sun Apr 23, 2017 8:49 pm

Post Tue May 09, 2017 2:13 pm

Re: Simple Master M175 Decoding

I was at Home Depot yesterday and gave this one a try. Worked a treat! Thank you.
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indigoalpha6

Newbie

Posts: 15

Joined: Wed Jan 25, 2017 10:24 pm

Post Tue May 09, 2017 3:19 pm

Re: Simple Master M175 Decoding

what! Master is improving their products? -how dare they.

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