The DanLock at 30: How My Father Built the Best Puzzle Lock Ever Made
Thirty years ago, in 1996, my late father Dan Feldman crafted the very first DanLock.
Looking back today, it is hard to overstate what a quiet revolution that brass padlock was. Back then, the term "sequential discovery puzzle" barely existed in the vocabulary of mechanical puzzle collectors. The idea of taking a standard, commercially manufactured padlock and precision-modifying its internals to create a multi-stage puzzle journey was a brand-new frontier. Yet the moment the DanLock entered the world, it captured the imagination of puzzlers across the globe and set a gold standard for trick locks that endures to this day.
From "Locked & Broken" and "TRIP" to the Ultimate Combination
What many people might not know is that the DanLock did not appear overnight. It took years of intense development, relentless trial and error, and countless prototype models to perfect. My father was initially driven by the ultimate evolution of two earlier lock puzzle designs he created: "Locked & Broken" and "TRIP".
In "Locked & Broken," he had explored the intriguing conundrum of dealing with broken keys, while "TRIP" introduced novel internal locking mechanics. By fusing the core concepts of both designs into a single, seamless package, he struck gold. Combining the best elements of those two precursors created a unique synergy: the perfect puzzle where every piece, key fragment, and step flowed logically into the next without revealing its secrets all at once.
The Hunt for a Factory: A "Crazy" Idea Meets Israel
Turning those early prototypes into a real, manufactured puzzle was a massive uphill battle. My father approached several lock manufacturers with his concept, but they all politely turned him down. From a purely practical business point of view, it made total sense for them to refuse. Who needed a "crazy guy" walking into a factory asking to make a lock specifically designed not to be opened easily? Modifying standard parts meant disrupting smooth production lines, tooling custom components, and introducing major manufacturing headaches for a small niche market.
It was only Israel, the owner of the Nabob Lock factory, who saw the magic in the vision and took on the challenge. Where others saw an inconvenient headache, Israel saw an exciting engineering trial. He opened his doors, worked closely with my father, and gave the DanLock its physical form.
The Intriguing Paradox: Why It Hooks Every Solver
Part of the DanLock's lasting magic is its everyday appearance. Everyone knows what a padlock looks like and how it operates: you insert a key, turn it, and the shackle opens. At first glance, the DanLock looks just like a standard heavy brass padlock you might buy at a local hardware store. It does not look like an intimidating mathematical puzzle or a complex geometric burr.
Then you examine what you have been given, and you are confronted with an absolute mind-bender of a paradox.
You hold a heavy padlock with a completely intact, working key locked directly through its closed shackle, making it impossible to remove while the lock remains locked. Alongside it sits a second key, but this one has been snapped clean into two separate pieces.
To solve it, you are faced with a double puzzle. First, figure out how to open a functional padlock. Second, figure out how to return everything back to its exact starting state.
Opening the DanLock is only half the journey. Returning it to its initial condition is a completely separate, brilliant mechanical logic test that leaves even seasoned solvers shaking their heads in admiration.
The Gold Standard: Balance, Pure Logic, and Everyday Appeal
What truly sets the DanLock apart in the puzzle world is its flawless equilibrium. It strikes a perfect balance between challenge and reward: it is clever enough to stump experienced solvers, yet every step relies on clean, elegant logic rather than frustrating guesswork or random fiddling. The sensation when a piece falls into place is pure satisfaction, delivering one unforgettable moment of clarity after another.
Because of this innate logical elegance, the DanLock's appeal reaches far beyond hardcore puzzle collectors. It has become a legendary gift for engineers, makers, technicians, and anyone with a mechanical mindset. Even total non-enthusiasts who have never picked up a mechanical puzzle in their lives find themselves completely captivated by it.
From the Workbenches of Nabob to the World
My connection to the DanLock is not just as a puzzle maker. It is woven into the memories of my youth.
As a teenager, I accompanied my father on his frequent visits to the Nabob factory. Amidst the scent of machine oil, brass shavings, and the clatter of heavy machinery, I took my very first steps into lockpicking and precision mechanics. I was privileged to witness the birth of the DanLock firsthand, standing alongside my father and Israel as they iterated through early models until reaching the final, elegant creation that stunned the puzzle community.
Where the Magic Happens: Hands-On at the Machinery
Through those factory visits, I became close friends with Israel myself. He was not just a supplier. He became a true mentor and partner. Decades later, carrying my father's torch forward meant returning to those same workbenches. Today, Israel and I still work hand-in-hand. He continues to cooperate with me, helping me develop my own lock puzzles at Puzzlocks with the exact same dedication, care, and craftsmanship he provided to my father 30 years ago.
Evolution, Craftsmanship, and Family Tradition
To keep up with evolving production standards, in 2017 the DanLock went through a thoughtful facelift, new branding, and essential engineering updates. Changes in the factory's base lock internal mechanics required subtle modifications. We took that opportunity to elevate the build quality even higher, all while ensuring that the brilliant, original solution remained completely untouched.
You can see the journey in the locks themselves. The first edition from the 1990s and the DanLock we make today share the exact same brilliant solution, refined over the years into the polished puzzle that leaves our workbenches now.
Today, keeping the DanLock alive has become a true family endeavor. Whenever we prepare a new production batch, it turns into a warm family gathering. Even the third generation, Dan's grandchildren, joins in, gathering around the table to help assemble, test, and package every single DanLock that leaves our hands. Seeing the younger generation take pride in their grandfather's legacy is easily one of the most rewarding parts of this journey.
Heritage in the Making: The Next Generation Joins the Workbench
An Enduring Global Legacy
Over the past three decades, the DanLock has generated an astounding amount of recognition. It has been featured in countless articles, endless blog reviews, and videos on YouTube that have amassed over 11 million views as solvers and creators around the world try their hand at cracking Dan's genius design.
In 1998, the legendary British puzzle collector and authority Edward Hordern (1941-2000) wrote about the DanLock in Cubism For Fun (CFF No. 45):
"Easily the best of the modern padlocks. It involves the solving of at least three quite distinct puzzles, which will keep even the ardent enthusiast occupied for some time."
Edward Hordern, Cubism For Fun, 1998
Reviewers continue to praise it with equal enthusiasm today:
"The DanLock deserves a spot in any puzzle Hall of Fame."
Boxes and Booze"The mechanism is absolutely marvelous. It is a pleasure to do this puzzle again and again."
PuzzleMad
Remarkably, after 30 years, demand for the DanLock has not faded. It is still being actively produced and sold to new generations of puzzlers worldwide.
For me, continuing to produce the DanLock is not just about making another lock puzzle. It is about carrying on a tradition and quietly saying thank you to my father every single time, for everything he taught me. Everything I know in this field, and everything I create today, exists because of him. Every time our family sits down to assemble a batch, inspect a mechanism, or hear from someone experiencing its magic for the first time, I feel his presence and passion live on.
Boaz Feldman
👑 Own a Piece of the Legacy
The DanLock is still made by hand, in the same tradition Dan Feldman began in 1996. It comes with a fabric carrying bag and an instruction card, and it ships worldwide.
New to puzzle locks and not sure where to start? Our buyer's guide covers the full collection:
How to Choose the Right Puzzle Lock
⚠️ Safety note: Contains small parts. Keep away from children under 3.