Double-ended brass winding key for carriage clocks, sizes ranging from 2mm to 4.75mm.
⭐ At a glance
📏 Sizes available: 2mm to 4.75mm
✅ Fits: French-style carriage clocks with a matching winding arbor
📦 Included: one double-ended brass winding key
✔️ Condition: New
🔧 What it does & how to use
A winding key is used to tension the mainspring of a mechanical carriage clock through its winding arbor, keeping the clock running. This double-ended key has a different size socket at each end, giving you two winding sizes in one tool rather than needing separate keys for each spindle.
- Check the arbor: Look at the square winding spindle on the clock's dial or back plate and measure it across the flats.
- Match the socket: Choose the end of the key whose square socket fits snugly onto that arbor without excessive play.
- Wind gently: Turn the key smoothly in the winding direction, stopping as soon as resistance increases sharply to avoid overwinding.
- Store safely: Keep the key with the clock or in a dry place to prevent the brass from tarnishing.
⚠️ Please check the exact winding arbor size on your carriage clock before use — a key end that is too loose or too tight can slip or strain the movement, so always test fit gently first.
