How to Attach a Pendulum to a Mechanical Clock Movement

Attaching a pendulum to a mechanical clock movement is an essential step in restoring or building a clock. Whether you’re working on a wall clock, mantel clock, or grandfather clock, properly installing the pendulum ensures accurate timekeeping and smooth operation. Follow this simple step-by-step guide to get your clock running beautifully.

Step 1: Understand the Pendulum’s Role

The pendulum is a weighted rod or wire that swings back and forth, regulating the clock’s ticking. Its length and placement control the speed of the movement, so getting it right is critical for accurate timekeeping.

Most mechanical clocks use a pendulum bob attached to a leader, which connects to a suspension spring.

Step 2: Gather the Right Tools and Parts

Before you start, make sure you have:

A compatible clock pendulum

The clock movement’s leader

A suspension spring

A screwdriver (if needed)

Pliers (optional, for small adjustments)

If you need parts, you can find pendulums, leaders, and suspension springs at Clockworks.com.

Step 3: Locate the Pendulum Hook

Look for the pendulum hook at the bottom center of the clock movement or leader. Some clocks may have the hook integrated into the crutch assembly or attached to the suspension spring.

Check that the leader moves freely from side to side. If it feels stiff, inspect for debris or bent parts and make adjustments as needed.

Step 4: Attach the Suspension Spring

If your suspension spring isn’t installed yet:

• Slide it into the slot at the top of the leader.
• Secure it using the pin or clip provided with your clock movement.

Make sure the suspension spring stays straight and free of twists to allow smooth swinging.

Step 5: Hook the Pendulum Leader

Find the notch or hook at the bottom of the leader. Carefully insert the top of the pendulum rod into this notch until it’s fully seated.

⚠ Tip: Avoid forcing the pendulum—bending the rod or leader can disrupt the clock’s timing.

Step 6: Test the Pendulum’s Swing

Gently push the pendulum to one side and release it. Listen for an even, steady ticking sound.

If the ticking sounds uneven or the pendulum stops:

• Adjust the crutch wire slightly left or right to set the beat.
• Keep adjusting until you hear a balanced tick-tock rhythm.

Step 7: Check for Obstructions

Make sure the pendulum swings freely without hitting the:

• Case sides
• Chime rods
• Internal components

If it’s too close to the case, check that the clock movement is mounted securely and centered. Also, use a bubble level to ensure the clock is hanging or sitting evenly.

Step 8: Adjust the Pendulum Length

If the clock runs too fast, lower the pendulum bob by turning the nut beneath it.

If it runs too slow, raise the bob by turning the nut upward.

Make small adjustments and let the clock run for several hours before making further changes.

Common Questions

Why won’t my pendulum keep swinging?

The clock may be out of beat or not level. Adjust the crutch wire and check the level.

Can I use any pendulum with my clock?

No. Each movement has a specific pendulum length. Verify compatibility before attaching a pendulum.

What if my pendulum hits the case?

Reposition the movement or gently adjust the crutch wire to reduce the swing arc.

Final Tips

Be patient and handle all parts carefully. A properly installed pendulum maintains the steady rhythm that keeps your clock ticking perfectly.

For help choosing the right components — or to order a complete mechanical clock kit with bell strike — visit Clockworks.com. We carry everything from precision movements to chime-ready kits, and our team is always happy to assist at clockworks@clockworks.com.

Updated on: 28/09/2025