A luxury tool for your luxury watch: Hassler Instruments
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Time to read 5 min
Precision meets permanence in the Hassler Instruments Spring Bar Tool — a refined, brass-bodied essential built for watch enthusiasts who appreciate tools as well-crafted as the timepieces they service.
Meticulously machined in the U.S., this luxury-grade instrument offers a weighty, confident feel and interchangeable tips for both standard and drilled lugs.
It’s not just functional — it’s heirloom-worthy.
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Table of Contents
A Tool Worthy of the Watch It Touches: Hassler Instruments
There’s a reason you don’t service a fine mechanical watch with the kind of spring bar tool that comes free with a strap.
Just as a great timepiece deserves a well-made strap, it deserves the right tool — one that matches the precision and respect you have for your collection.
The Hassler Instruments Spring Bar Tool was created not for the masses, but for those who understand that the details matter — especially the tools behind the scenes.
Crafted with intention and refined through experience, the Hassler tool is more than functional. It’s tactile. It’s reliable. It feels permanent. This is what happens when a spring bar tool isn’t an afterthought, but a carefully engineered object built to last a lifetime — or two.
Machined in the USA from Solid Brass
At the heart of the Hassler bolt action tool is its body — solid brass, carefully machined in small batches right here in the United States.
Brass is a material with soul. It patinas. It warms to the touch. It ages, gracefully, just like the watches it services.
Unlike plastic-handled tools or lightweight aluminum options, the Hassler tool feels substantial in the hand. It doesn’t flex or wobble. It sits with confidence on the desk or in your palm.
Every Hassler tool is precision-turned to strict tolerances, with a deep respect for materials and process. The threads are smooth, the knurling is intentional, and the balance is intuitive.
This isn’t a mass-market product — The Hassler tool is a work of small-batch craftsmanship, built for enthusiasts who care about how things are made.
Interchangeable Tips for Precision Work
The most common frustration with spring bar tools? One-size-fits-none tips that don’t handle real-world variety.
The Hassler Instruments bolt action spring bar tool features a convenient - and satisfying to operate - mid body bolt action design which provides instant access to a Bergeon 6767-AF fine fork spring bar tip.
When not in use the tip retracts into the tool body, protecting the tip until your next strap change.This is a tool designed not only to perform, but to protect your watches in the process.
A second option in the Hassler tool, the Bergeon 6767-BF Fine Pin style tip, is accessed by unscrewing the tool end cap. This mini tool is useful for bracelet clasp resizing or changing straps on watches with drilled lugs.
Ergonomics Without Gimmicks
Functionality isn’t about gimmicks — it’s about intention. The Hassler tool’s design is refreshingly minimal: no molded plastic grips, no bright colors.
The Gladfellow collaborative edition adds a lathe turned grip along the top as well as the signature Gladfellow logo on the end cap.
Each tool is also marked for authenticity with "HASSLER" on the front side of the pocket clip and numbered on the inside of the pocket clip.
But looks aren't everything. The Hassler tool sits naturally in the hand and offers just the right weight for steady control, a quality that is extremely important when tinkering with strap changes on luxury watches.
Compact Enough to Travel. Substantial Enough to Keep
At just under 6 inches long and less than 1/2 inch in diameter, the Hassler tool fits perfectly into a watch roll, tool pouch, or drawer — but it’s not something that disappears. Its solid brass construction gives it a weight that makes it feel purposeful. It’s light enough to carry, heavy enough to be stable during use.
Whether you’re at your home workbench or sitting at a hotel desk mid-trip, the Hassler Instruments bolt action spring bar tool is what you reach for when swapping straps or adjusting bracelets. It’s an ideal blend of portability and permanence — compact enough for travel, and good enough that you’ll want to take it with you.
This is a rare quality in tools today: the desire to own just one Hassler, and let it live with you for the long run.
Made for the Collector Who Values the Details
The Hassler Spring Bar Tool isn’t for everyone. That’s intentional. It’s for the collector who has curated not only their watches, but the accessories, cases, straps, and tools that go with them. It’s for someone who notices when threads are smooth and consistent. Who values a knurling pattern that doesn’t slip. Who cares that the tool doesn’t just work — it feels good to use.
When you pick it up, it doesn’t feel like something that came in a kit. It feels like something you chose. That’s the difference between having tools and having your tools. And while the Hassler may seem like a small detail in the big picture of horology, it’s exactly those details that elevate the experience of collecting.
Because for you, changing a strap isn’t just a chore. It’s a ritual. And every ritual deserves the right instrument.
Conclusion
Do not miss the opportunity to own the absolute best in spring bar tools. It's a perfect complement to any watch collection.
- Special Gladfellow edition with grips.
- Engineered from solid brass for a sturdy weight and excellent stability.
- Includes replaceable Bergeon Fork, Fine: 6767-AF on the tip.
- Includes replaceable Bergeon Pin, Fine: 6767-BF under the screw cap.
- Bolt action protects the spring bar tip.
- Small batch and individually numbered.
- Made in the USA.
Frequently Asked Questions
How many tips does the tool have?
The tool includes a replaceable Bergeon Fork, Fine: 6767-AF on the tip and a replaceable Bergeon Pin, Fine: 6767-BF under the screw cap.
Are there any other variants of the tool available?
Yes. Occasionally, we drop the extremely limited Brass & Ultem version linked here: /products/hassler-instruments-tool-ultem
How come availability is so limited?
These tools are made by hand and can only be manufactured in small batches. While the waitlist for them is long, we do our best to drop the Gladfellow edition as often as possible.
Who We Are
About Gladfellow
Known for their carefully curated goods of expert craftspeople from around the world, Gladfellow has been the home for sophisticated, boutique luxury accessories since its inception in 2023.
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