A pin, a hole in the mast, and the hammer resting dead on that pin — this is the safety feature every Revolution Telescopic post driver shares, and the habit that stops the machine dropping its gear on you.

In this video you'll see the travelling hole on the mast and how it works. Tony drops the pin in and the hammer — or an auger kit or rock spike kit — sits held on it. Bump a lever by mistake and nothing comes down.

You'll also see exactly when to use it: setting up a new kit until you're used to it, at lunchtime, and any time you stop work or step off the machine. It's shown on the SS here, but every Telescopic model works the same way.

And why it matters — it's about what happens when you're off the seat. An unpinned hammer can be dropped by something as daft as a cattle beast leaning on the mast. Pin in, and the load is dead: safe around stock, kids and anyone nearby.

The safety pin is on every Revolution Telescopic post driver — the 180, Swinga, SS and RM. All designed by fencing contractor Tony White. Made in New Zealand.