Here's what other sites are saying:
Replacement 18mm expander collar for Leki hiking/trekking poles; the expander collar allows the pole to open and lock in place.
The original Leki locking system. Optimal hold in all Leki Series poles prior to 2003. Sold in pairs.. . . This fits all Expander model poles. If your pole has an ELS or SLS graphic on the bottom of the upper shaft, you can not use this locking system
Replacement expander (lock) for your Tour Anti-shock or pre-2003 Makalu telescopic Leki poles.
- Ramsey Outdoor
Leki Expander System FEATURES of the Expander System by Leki Older Model Makalu Poles
Leki Easy Lock System Expander - Pair
Leki Standard Lock System Expander - Pair
Leki Super Lock System Expander - Pair
Leki Carbide Flextip - Pair
$13 - $21
Leki Security Clip - Pair
Leki Summer Shark Glove - Pair
Leki Aergon Photo Adapter
$22 - $29
Black Diamond Trekking Pole Tip Protector