Hats off to the dockyard workers in Vietnam, many of the tools that they use are cobbled together and improvised from other things, my particular favorite are these brushes made from twigs held together with cable ties, I watch them knock them up, some with handles and song just like this.
The welding chaps all carry home made chipping hammers, one is made froma couple of bolts and one from a piece of conrcrete reiforcing bar.