The Best Watch Tools for Changing Straps

A spring bar is a tiny telescoping tube under constant tension, held in a hole roughly a millimetre across. To remove it you have to compress it sideways while simultaneously levering the strap end out of the lug gap — two forces at once, in a space you cannot properly see, next to a surface you cannot afford to mark.

Three things separate a good tool from the free one in a strap box:

• The fork geometry.A well-cut fork seats on the spring bar's shoulder and stays there under load. A stamped, over-wide fork rides up and off. This is the whole ballgame.
• Steel hardness and finish. Soft steel deforms after a handful of uses, and a deformed fork slips. A hardened, polished tip also drags less against the lug.
• Replaceable ends. Tips are consumables. A tool whose ends screw out and replace lasts a lifetime; one with fixed ends becomes a liability the moment it dulls.

If your watch has drilled lugs — small holes through the outside of the lug — none of this applies with the same urgency: you push the bar out from outside with a pin and never go near the case flank. Check for drilled lugs before you buy anything.

For most people this is the whole answer. The Barton kit is a stainless-steel tool with a forked end on one side and a tweezer head on the other for grabbing small spring bars, it ships with two extra tips, and it has a metric ruler engraved along the side so you can measure a lug width without hunting for a caliper. It costs around $13.99 on Amazon.

At that price the calculation is not close. If you own one watch and change its strap twice a year, this is all the tool you will ever need, and the ruler alone saves the common mistake of ordering a 22 mm strap for a 20 mm watch. The honest limitation is that the steel is not Bergeon-grade: the tips will dull faster under heavy use, which is exactly why it comes with spares.

Bergeon is the Swiss tool house the watch industry actually uses, and the 6767-Fis the spring-bar tool you will see on a watchmaker's bench. It is the right answer for most people who own more than one watch or change straps often: it works on metal bracelets, on leather and rubber straps, and on drilled lugs, which no single cheaper tool does equally well.

Two design details justify the price. The ends screw in and are replaceable, so the tool is effectively permanent — when a fork finally dulls you replace the tip rather than the tool. And the long stainless handle gives real leverage on a stubborn bar, which is precisely the situation where a short tool slips and does the damage.

The 6767 family runs in several variants (the -F is the common general-purpose one). If you are only ever going to buy one proper tool, this is it.

Also sold by watch-tool specialists such as Esslinger — we earn nothing there, but it is where you go if you want to be certain the tool is genuine, since Bergeon is widely counterfeited.

A steel bracelet on a tightly toleranced case — a Rolex-style Oyster end link is the classic example — is the hardest spring-bar job there is, because the gap you need to reach into is barely wider than the tool. This is where a conventional forked tool is most likely to slip, and where the 7825 tweezers earn their keep.

Instead of levering from one side, the tweezers compress both ends of the spring bar simultaneously and hold it compressed while you lift the bracelet free. The forces cancel, nothing is being pushed against the case, and the bar cannot ping across the room. It is the safer professional choice for bracelets and tight lug openings, and it is the tool to buy second rather than first.

It is not a general-purpose replacement: on a thick rubber strap or a leather strap with a padded end, the tweezers cannot get purchase and the 6767 is easier. Most people who own both use the 6767 for straps and the 7825 for bracelets. If your collection leans towards bracelets — see our Submariner and Black Bay reviews for the kind of watch this matters on — buy them in the other order.

Three cheap things reduce risk further, and one of them is essentially free.

• Lug protection film or tape. A thin adhesive film applied across the case flank between the lugs before you start. If the tool slips, it hits the film. This costs a few dollars and is the single highest-return purchase on this page for anyone working on an expensive watch.
• A microfibre cloth under the watch. Free, and it does two jobs: it stops the caseback picking up scratches from the desk, and it catches a spring bar that pings loose instead of losing it under a sofa.
• A 10× loupe.Useful for finding the spring-bar shoulder, checking whether your lugs are drilled, and inspecting a strap's stitching before you buy it. Not essential; genuinely handy.

Five rules, in order. Follow them and a $14 tool is safer than a $40 one used carelessly.

The large boxed "watch repair kits" sold for twenty or thirty dollars — the ones with a caseback opener, a movement holder, hand pullers and forty other pieces — are almost entirely wasted money for an owner. The spring-bar tool inside them is usually the weakest part of the set, and everything else is for jobs you should not be doing yourself on a luxury watch.

In particular: do not open the caseback. On a screw-down case you will mark it, you will break the water resistance, and on many watches you will void the warranty. A watch that needs the back off needs a watchmaker — our luxury watch service guide covers intervals and realistic costs. Battery changes on a quartz watch fall in the same category: the twenty dollars a shop charges buys a pressure-tested reseal you cannot do at home.

Buy the Barton Spring Bar Tool Kit at about $14 and a few dollars of lug protection film. For the overwhelming majority of owners that is the complete answer, and the ruler on the side will save you an incorrectly sized strap at some point, which pays for the tool on its own.

If you change straps regularly, or if the watch is expensive enough that a slip would ruin your week, step up to the Bergeon 6767-F — replaceable screw-in ends and a long handle make it a lifetime tool, and it handles bracelets, leather and rubber equally well. Add the Bergeon 7825 tweezers only if you regularly remove steel bracelets, where they are meaningfully safer than any forked tool. Beyond that, the best tool purchase is not a tool at all: buy straps with quick-release bars and the problem largely disappears.