If something fails again (not necessarily a dead short) and the device starts drawing, e.g. 5A, it will catch fire without any RCD tripping, nor any fuse protecting it from overcurrent.
Actually, dead shorts are quite uncommon. The motor may start drawing more current and generating sparks as the brushes wear down, until the rotor locks and the thing starts drawing more current, producing more smoke and eventually flaming.
Cool if you want to see some toxic fireworks.
So, please do not leave that machine unattended.
In such cases, if I cannot find an appropriate fuse, I just end up buying a new machine altogether. Sorry, my health is way more important than a 30$ broken tool.