Dudley Lock Combination Recovery Serial Number
Alright, there are lots of videos out there dealing with Master combination locks, but this how-to video will show you how to open a Dudley combination lock. These locks are commonly used in schools, so you've likely seen one there. This method opens the lock permanently, meaning you won't be able to close it afterward. You'll need a flat head screwdriver and a little patience. The method involves prying off the style, allowing you to get to the insides of the lock. After that, you'll be pushing down on all the insides of the combo lock.
Best Answer: Put a mechanic's stethoscope to the lock. Spin right a few times to clear it. Gently turn left until you feel a slight change in resistance. You will also hear a light thud. Spin to the right and repeat, then left again. Each time you do it, write the number down on a sheet of paper.
Try it now and see if you can crack a Dudley lock!
Finding the 'First Locked Position' • Set the dial to 0. • Apply full pressure upward on the shackle as if trying to open it. • Rotate dial to the left (towards 10) hard until the dial gets locked. • Notice how the dial is locked into a small groove. If you're directly between two digits such as 3 and 4, release the shackle and turn the dial left further until you're into the next locked groove. However, if the dial is between two half digits (e.g., 2.5 and 3.5), then enter the digit in-between (e.g., 3) into First Locked Position in the calculator below.
Finding the 'Second Locked Position' • Do all of the above again until you find the second digit below 11 that is between two half digits (e.g., 5.5 and 6.5), and enter the whole number (e.g., 7) into Second Locked Position in the calculator below. Finding the 'Resistant Location' • Apply half as much pressure to the shackle so that you can turn the dial.
• Rotate dial to the right until you feel resistance. Rotate the dial to the right several more times to ensure you're feeling resistance at the same exact location.
• Enter this number into Resistant Location. If the resistance begins at a half number, such as 14.5, enter 14.5.
Inputting the Numbers into My Calculator • Make sure all three numbers are entered into the calculator at the top of this page, then click Find Combos. We now have 20 possible combos, but we'll reduce this further. Keep reading! Finding the Right 'Third Digit' • Set the dial to the first possibility for the Third Digit. • Apply full pressure upward on the shackle as if trying to open it. • Turn the dial and note how much give there is.
• Loosen the shackle and set the dial to the second possibility for the Third Digit. • Apply full pressure upward on the shackle as if trying to open it.
• If there is more give on the second digit, click the second digit in the calculator above. Otherwise, click the first digit.
Testing Out the 8 Combinations on Your Lock • You are left with 8 possible combinations. Test them all until one works with the standard instructions below. Standard Instructions for Opening a Combination Lock • Turn right three times. Stop at First Digit. • Turn left one full turn passing 1st number and stop at Second Digit. • Turn right and stop at Third Digit. Pull shackle.
Hi Samy, Same as others here, I have an older lock from maybe 5-6 years ago, serial on bottom reads 1211CF. Same trouble. The dial locks at 2-3, so I skip. The first locked position then is 5.5 and 6.5.
Next, it locks between 9 and 9.8. Then the next locked position is 12.2 and 13.1. Next is 15.5 and 16.5. Kicker here is that I do know the combination on this lock, as it was never used and still has the sticker. Happy to work with you on this. Would like to help amend your code to make it universal if possible. I'd love to know the math too.
I had to combine this with the 'in 100 tries or less' method. The 3rd number was wrong, but easily found manually, the 1st number seems to be generated based on the resistance number, and even though it worked it wasn't the right number (only 1 digit off so maybe human error or glitch in the matrix) but regardless, 1 digit discrepancy still works in most cases. And my 2nd number was also only 1 digit off. But I could generate the right digit using the '100' algorithm. This all makes me REALLY want this formula, because I feel like with a little tweaks you can have a definitive 3rd, 1st, and maybe narrow down the 2nd.
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