Why do my trekking poles collapse under weight?

It's a disconcerting, and potentially dangerous, moment: you plant your trekking pole on a steep descent, lean your weight onto it, and instead of solid support, the pole collapses—slipping a few centimetres and throwing you off balance. The short answer to this problem is almost always a dirty or poorly adjusted locking mechanism. This guide covers the specific causes and fixes for both lever-locks and twist-locks, the maintenance routines that prevent the problem, and the simple field fixes that can save your walk.

The Mechanics of a Lock

A trekking pole stays extended because of friction. A locking mechanism creates pressure between the inner and outer shaft sections. When this friction is compromised, the pole slips. The two main culprits are dirt and a lack of clamping pressure.

Lever-Locks (FlickLock, SpeedLock, Powerlock) – The Diagnosis

Lever-locks are generally more reliable than twist-locks, but they are not immune to slipping. The most common cause is a loss of tension in the cam mechanism.

Cause: Loss of Clamping Pressure

Over time, the metal cam that clamps the shaft can lose its tension. The lever closes more easily than it should, and the lock slips under load.

Fix: Adjust the Tension Screw

Most lever-locks have a small Allen key screw on the side of the lever.

1. Flip the lever open.
2. Using an Allen key (usually 3mm or 4mm), turn the screw clockwise by a quarter-turn. This increases the clamping pressure.
3. Close the lever and test it. It should now feel firmer to close. If it still slips, repeat the adjustment.

Cause: Dirt on the Cam or Shaft

Mud and grit act as a lubricant, reducing the friction between the cam and the shaft.

Fix: Clean the Contact Surfaces

1. Flip the lever open.
2. Wipe the inside of the cam with a clean cloth.
3. Wipe the shaft where the cam touches it.
4. Close the lever and test it.

Cause: Worn Cam

If the cam is worn down or deformed, it may not be able to generate enough clamping force.

Fix: Replace the Lock

If adjusting the tension and cleaning doesn't work, the lock mechanism itself may be worn. Check the manufacturer's website—most brands sell replacement lever-locks.

Twist-Locks (Internal Expanding Wedge) – The Diagnosis

Twist-locks are more prone to slipping than lever-locks, as they rely on an internal, often plastic, wedge.

Cause: Dirty Wedge and Inner Tube

This is the most common cause of a slipping twist-lock. The plastic wedge, which is designed to expand against the inner wall of the upper tube, gets coated in a layer of black, greasy dirt.

Fix: Clean the Mechanism

1. Unscrew the lower section completely to remove it from the upper section.
2. Inspect the plastic wedge. It will likely have a layer of black, greasy dirt on it.
3. Clean the wedge with a cloth and some isopropyl alcohol or mild soapy water.
4. Clean the inside of the upper tube using a cloth or a long brush.
5. Dry everything thoroughly.
6. Reassemble the pole and test it.

Cause: Worn Wedge

Over time, the plastic wedge can wear down, meaning it can no longer expand enough to create sufficient friction.

Fix: The "Tape" Trick

If the wedge is worn and no longer expands enough, you can add a tiny amount of material to increase its diameter.

1. Wrap a single, thin layer of electrical tape or plumber's tape around the wedge (the part that expands).
2. Reassemble the pole and test the lock. This effectively increases the diameter of the wedge, improving the grip.

Cause: Over-Tightening

If you have a habit of over-tightening a twist-lock, you can deform the plastic wedge. This can cause it to slip.

Fix: Replace the Wedge

If the wedge is deformed or cracked, it needs to be replaced. Check the manufacturer's website for spare parts.

The "Boiling Water" Trick (For Both Systems)

This is a classic trick for stubborn locks.

1. Boil a kettle of water.
2. Submerge the locking mechanism (the tip or the upper section) in the boiling water for 30-60 seconds.
3. The heat will expand the metal slightly and soften any dried dirt or adhesive.
4. Dry the mechanism and reassemble the pole.
5. Tighten the lock while it's still slightly warm. As it cools, it will grip more securely.

The Field Fix – When You're on the Hill

If your pole slips mid-walk, you can often make a temporary fix.

The "Rocks" Trick (For Lever-Locks)

1. Find a small, flat pebble.
2. Place it between the shaft and the lever-lock cam. This acts as a wedge, increasing the clamping pressure.
3. Close the lever. It will be tight, but it should hold.

The "Grip" Trick (For Twist-Locks)

1. Extend the pole to its correct length.
2. Squeeze the locking mechanism with a cloth or glove.
3. Try to twist the sections. This can sometimes improve the grip.

How to Prevent Slipping

The best way to deal with a collapsing pole is to prevent it.

• Clean After Every Muddy Walk: Rinse the locks and shafts with clean water. Dried mud is abrasive and acts as a lubricant.
• Dry Thoroughly: Moisture reduces friction. Store your poles extended and dry.
• Check Tension Before Each Walk: Give the locks a quick test. If they feel loose, adjust them.
• Lubricate the Right Parts: Use a tiny amount of silicone grease on the threads of a twist-lock (not the wedge) and on the pivot point of a lever-lock (not the cam).

A Quick Comparison: Why Poles Slip

The "Why Now?" Question

A common question is: "Why did my pole suddenly start slipping when it was fine before?" The answer is often:

• A Muddy Walk: The grit has worked its way into the mechanism.
• A Change in Temperature: Cold weather can cause the plastic in a twist-lock to shrink slightly, reducing its grip.
• A Heavy Load: You may have leaned on it with more weight than usual, causing the lock to give way.

When to Give Up

If you have tried all the fixes—cleaning, adjusting, tape, and boiling water—and the pole still slips, it's time to replace it. A slipping pole is a safety hazard. It can collapse on a descent, causing a fall. If the plastic wedge is worn down, or the metal cam is deformed, no amount of cleaning will fix it.

The Final Checklist

• □ Is the lock clean? (Remove mud and dirt)
• □ Is the tension adjusted correctly? (Firm, not too tight)
• □ Is the wedge/cam in good condition? (No cracks or wear)
• □ Have you tried the "tape" trick? (For twist-locks)
• □ Have you tried the "rocks" trick? (For lever-locks)
• □ Is it a safety hazard? (If yes, replace it)

Over to You

A collapsing trekking pole is a fixable problem, but it requires the right diagnosis. Lever-locks usually need a tension adjustment or a clean. Twist-locks often need a thorough clean of their internal mechanism. By understanding these two systems and keeping them maintained, you can prevent the frustration of a collapsing pole and keep your walking safe and enjoyable.