Using the Petzl NAJA Friction Saver with a Stationary Rope System (SRS)

Designed specifically for tree care, the Petzl NAJA is an adjustable, retrievable friction saver that enables climbers to protect the tree while efficiently managing rope systems. Featuring an integrated high-efficiency pulley and a strap with multiple adjustment points, the NAJA allows for clean rope installation, smooth ascent and descent, and controlled retrieval from the ground.

In this guide, we’ll cover key tips and best practices for using the NAJA with a Stationary Rope System (SRS)—from canopy installation to ground retrieval.

1. Selecting the Anchor Point

Once you’ve reached your working height in the canopy, choose a strong, healthy limb suitable for anchoring your climbing rope. The limb should offer:

• Sufficient diameter and structure to support dynamic loading

• A natural line for your ascent and descent

• Clearance for the NAJA pulley to operate without obstruction

2. Installing the NAJA in the Canopy

To set the NAJA in place:

• Pass the adjustable strap over the chosen limb.

• Insert the NAJA aluminum frame into the correct adjustment slot, based on the diameter of the limb. The strap features multiple slots for precise positioning.

• If needed, you can girth hitch a second strap to the final adjustment slot for additional reach.

Key Tip: Ensure that the angle at the pulley remains 90 degrees or less to avoid side loading and promote optimal performance during ascent and descent.

3. Feeding the Rope and Building the SRS Anchor

With the NAJA securely positioned:

• Thread the rope over the pulley, beginning on the stopper side of the frame.

• Feed the rope down to the ground until both ends are accessible.

Next, build the ground anchor by:

• Tying a blocking knot with a loop on one tail of the rope.

• Clipping a carabiner through the loop to secure the knot.

• Attaching the Retrieval Accessory Carabiner (included with the NAJA) to the rope nearest the stopper side of the frame.

At this point, your SRS climbing system can be installed onto the rope, with your climbing device connected as usual.

Always weight the system fully before climbing, to ensure correct seating of the friction saver and to verify that all components are secure.

4. Preventing the NAJA from Falling During Retrieval

Before leaving the canopy, take a precaution to prevent the NAJA from falling during retrieval:

• Pass a throw line over an adjacent branch.

• Clip the throw line into the dedicated slot on the black retrieval sling of the NAJA.

• Ensure the other end of the throw line reaches the ground, allowing controlled descent of the device.

This step adds an additional safety and control mechanism for lowering the NAJA when removing the climbing rope later.

5. Rope Removal and Retrieval of the NAJA

Once work is complete:

1. Remove the climbing system from the rope.

2. Tie the two tails of the rope together—this maintains even control during the retrieval.

3. Pull on the block side of the rope to bring the blocking knot and carabiner down within reach.

4. Remove the carabiner, and untie the blocking knot.

5. Detach the knot connecting the rope tails, and girth hitch the retrieval ball to the spliced end of the rope.

6. Pull on the opposite side of the rope while maintaining light tension on the throw line.

As the retrieval ball passes through the pulley, it will catch the Retrieval Accessory Carabiner, which will pull the NAJA frame free from the adjustment strap. From there, the throw line allows you to lower the NAJA gently and under control.

Conclusion

The Petzl NAJA friction saver offers arborists a refined blend of canopy protection, system efficiency, and controlled retrieval. When paired with a Stationary Rope System, it creates a clean, climbable setup that’s easy to install and just as easy to remove—making it a go-to tool for climbers who value both performance and tree care.

Recommended Gear

• Petzl NAJA Adjustable Friction Saver

• Petzl Chicane + Zigzag System for SRS Climbing

Peace on your Days

Lance