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This is a genuine Ronda winding stem designed for the Ronda 3520.D quartz movement, used to connect the crown to the movement for time setting and date adjustment. As an original factory part, it ensures smooth engagement, accurate hand setting, and reliable long-term performance .
| Feature | Description |
|---|---|
| Compatible Movement | Ronda 3520.D quartz movement (also compatible with 3540.D) |
| Part Type | Winding Stem / Crown Stem |
| Core Function | Connects crown to movement for time setting and date adjustment |
| Material | Precision-machined steel |
| Origin | Switzerland |
| Product Type | Genuine Ronda part |
Ronda 3520.D Technical Background:
| Parameter | Value/Description |
|---|---|
| Movement Type | Quartz |
| Functions | Hours, minutes, seconds, date |
| Battery | 371 / SR920SW |
| Battery Life | Approx. 3-5 years |
| Jewels | 1 jewel / 3 jewels (varies by version) |
| Step | Description |
|---|---|
| 1 | Open the case back and carefully remove the Ronda 3520.D movement |
| 2 | Press the movement setting lever while pulling out the old winding stem |
| 3 | Check the setting lever, winding pinion, and clutch wheel for damage |
| 4 | Clean the winding stem mounting hole – remove old oil and debris |
| 5 | Insert the new winding stem into the movement, gently rotate until a “click” indicates it is locked in place |
| 6 | Screw or press the original crown onto the stem (depending on crown type) |
| 7 | Reinstall the movement into the case and test all functions |
Tools Required: Tweezers, spring bar tool (depending on crown type).
| Aspect | Description |
|---|---|
| Inspection Period | Check the winding stem for corrosion, bending, or wear during each battery replacement |
| Wear Indicators | Replace the stem if it shows stripped threads, bending, corrosion, or thread wear |
| Cleaning Method | Gently wipe with isopropyl alcohol; do not soak. Avoid corrosive cleaners |
| Lubrication | Microscopic lubrication may be applied to contact points using professional watch oil |
| Storage | Store unused stems in a dry, dust-free environment to prevent oxidation |
Q1: Can I install this winding stem myself?
A: If you have experience with watch repair and proper tools, you can install it. However, due to the precision required, professional installation is recommended for those without experience .
Q2: How do I remove the old winding stem from a Ronda 3520.D movement?
A: Locate the setting lever (a small push-button or tab on the movement). Gently press it while pulling the stem outward. Do not force it – if it doesn‘t release, you may be pressing the wrong lever.
Q3: What should I do if the stem does not click into place?
A: Remove the stem, check for debris or damage, and try again. Ensure you are pressing the setting lever correctly. If it still won‘t lock, the movement or stem may be damaged .
Q4: What is the battery life of the Ronda 3520.D movement?
A: The Ronda 3520.D has a battery life of approximately 3-5 years when using a 371 / SR920SW battery.
Q5: Why is the winding stem important for movement performance?
A: The winding stem is the critical link between the crown and the movement‘s keyless works. A high-quality stem ensures smooth time setting and protects the movement‘s internal components from damage .
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