In this hilariously starting off with a "Save Me!" plea from a 1909 tool named "THE ONLY", the Hand Tool Rescue guy restores a saw blade filer that is in dire need of some tender loving care. It is one of the many restoration videos he has done over time, and it is a delight to watch him at work.
It is an intricate machine with many moving parts, and the whole process shows several ancient techniques that are worth preserving if only to make sure we can keep this old tech working in this modern age, be it for functional or sentimental reasons. Respect for where we came from will help us build a better future, that is my view on technology.