iPhone 4 video quality is great for a phone – but is limited by the fact that light hand-held video cameras deliver shaky video.

While Tiffen has announced an iPhone Steadicam, you can also build your own.

This video, by Spencer S. Watson, demonstrates how he built a DIY iPhone Steadicam out of a modified Nerf gun handle and $40 of parts from Home Depot.

Check out the demo video, below, to see how it works!