Changing the strap transforms a watch more surely than any dial detail; the trick is doing it without leaving a scratch on the lugs. I suggest we gather the good practices here: how spring bars work, how to measure lug width, which tools to use and which precautions to take. Metal link bracelets are already covered in the thread on sizing a bracelet; this one is about leather, rubber and fabric straps. Where would you start?
[[PHOTO: Montre posée cadran vers le bas sur un chiffon doux, cornes et pompes visibles, outil à pompes à côté]]
Editorial summary, not independently verified.
Beginner question first: what exactly is a spring bar? And how do I know which strap width to choose?
The spring bar: the small spring-loaded bar that holds the strap between the lugs. You compress it, it goes into the holes in the lugs and expands to lock in place.
Lug width: the inside distance between the two lugs, in millimetres (often 18, 20 or 22 mm). You measure it with calipers or read it on the model’s spec sheet. The strap must be exactly that width.
Confidence level: high on both points, these are the basics.
And the scratches, where do they really come from? Almost always from the tool slipping as you compress the spring bar. Three simple precautions:
- Cover the lugs with masking tape (painter’s tape).
- Work on a soft surface, dial down.
- Use the fork end of the spring bar tool, not a kitchen screwdriver.
And why does everyone forget drilled lugs? If the lugs have a small hole on the side, you push the spring bar from the outside, without sliding a tool against the case.
[[PHOTO: Gros plan d’une corne protégée par du ruban de masquage, fourche de l’outil engagée sur la pompe]]
A small table of attachments, because everyone mixes them up:
| Attachment |
Tool |
Scratch risk |
| Standard spring bars |
spring bar tool (fork) |
medium |
| Quick-release spring bars (small lever) |
none, just fingers |
low |
| Drilled lugs |
small pin to push |
low |
It’s like flat-pack furniture: the right fitting does all the work. To see what a well-chosen leather strap looks like on the wrist, the dress watches on leather thread is perfect.
So, to sum up: measure the lug width, protect the lugs, dial down, and the fork rather than a screwdriver. And for a rubber strap or a NATO, is it different?
For rubber, the spring bar principle stays the same. A NATO, on the other hand, slides between the spring bars, once they’re back in place, and the case: no tool once the bars are fitted, but the strap adds thickness under the watch. To compare how a diver looks on rubber, on a NATO or on a steel bracelet, the thread (originally written in Spanish) “My Submariner on rubber, NATO or bracelet?” shows the difference well.
Step-by-step summary (high confidence on the method, medium on the choice of attachment, which depends on the model):
- Measure the lug width in millimetres; the strap must be the same width.
- Identify the attachment: standard spring bars, quick-release spring bars or drilled lugs.
- Protect: masking tape on the lugs, watch dial down on a soft cloth.
- Remove: fork of the tool on the shoulder of the spring bar, compress, release; never a screwdriver that slips.
- Fit: one end of the spring bar in its hole, compress the other, let it seat, then pull gently on the strap to check it holds.
- NATO: slides between the spring bars, once they’re back in place, and the case.
For metal link bracelets, see the thread on sizing a bracelet.
Editorial summary, not independently verified.
Thanks, that’s exactly the step-by-step I was hoping for. The last check, pulling gently on the strap, is the one people forget most often.