If you've ever needed to shorten or repair a chain — whether for a motorcycle, bicycle, or piece of machinery — you know that a chain breaker tool is one of those things you reach for once in a while but absolutely need when the time comes. In this video, the creator at Maisternia skips the store entirely and fabricates a working chain breaker from scratch using basic workshop materials and no specialized equipment.

What makes this video stand out from the usual DIY tool builds is the completeness of the process. You see the full journey from raw scrap metal to a finished, functional tool — including layout, cutting, drilling, threading, and assembly. The creator doesn't rely on a CNC machine, a lathe, or anything you wouldn't find in a modest home shop. That constraint is exactly what makes it educational: you learn how to think through mechanical advantage, alignment, and threading when you can't just buy precision parts off the shelf.

Crucially, the video ends with a real-world test. The tool is put to work breaking an actual chain, so you can judge for yourself whether the design holds up under load. Too many DIY tool builds skip this step, leaving you wondering if the thing actually works. Here you get proof.

For anyone interested in metalworking fundamentals — drilling and tapping holes, working with threaded fasteners, and building simple mechanical tools — this is a solid, no-nonsense project to learn from.