Supplied
One winding tool
Not specified · Crown-contact winder
Bergeon 31409 Elastomer-Contact Winding Tool
An anodized-aluminum body with an elastomer insert for manual winding through the crown.
Check the actual crown shape and available access, not just its diameter.
$49.95Nov 6, 26, 08:10 PM · New York
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- Maker/model as listed Bergeon 31409
- Body Anodized aluminum
- Contact insert Elastomer
The physical equipment
Construction & package details
What this choice changes
Elastomer contact for winding through the crown
Choose the Bergeon 31409 when you need a hand tool that contacts the external winding crown. The anodized-aluminum body carries a soft elastomer insert, which the seller describes as adapting to different crown shapes. It is a different interface from the arbors used for mainspring work inside a movement.
The stated opening diameter is 2.5–10 mm and the listed tool weight is 35 g. Match the crown’s actual shape, clearance and contact arrangement rather than treating that opening range as a guarantee for every crown.
One winding tool is supplied. The tool is offered for mechanical wristwatch winding after repair; follow the actual watch’s winding requirements. No crown-specific compatibility list or calibrated torque setting is supplied.
Specifications & supplied details
| Detail | Listed specification |
|---|---|
| Maker/model as listed | Bergeon 31409 |
| Body | Anodized aluminum |
| Contact insert | Elastomer |
| Opening label | 2.5–10 mm |
| Listed tool weight | 35 g |
| Supplied | One winding tool |
Check the working requirements
Crown contact
Check the actual crown shape and available access, not just its diameter.
Watch requirements
Follow the actual watch’s winding requirements; no calibrated torque is supplied by this tool.
Limits to keep with the choice
- No universal crown fit, grip-force or calibrated torque specification is established.
Questions before you choose
Will any crown within 2.5–10 mm fit?
The seller gives that opening diameter, but the actual crown shape, available access and contact fit also matter. The range is not a universal crown-fit guarantee.
Which part touches the crown?
The tool has an elastomer contact insert in an anodized-aluminum body. The seller describes the soft insert as adapting to different crown shapes.
Guides for this choice
Other equipment to consider
Selected listing descriptions, specifications and source images were compared for this reference. No hands-on trial is claimed. Product identifier: B07N3WBJTZ.