Fixing a grinder by tinkering is quite energy consuming, at least for me.
I think it would be sweet to have a few "narrow-spectrum fixing tools" that requires no skill and provides an energy-saving (but more current-consuming) alternative to tinkering.
For say, a single-use "Melamine sponge" can be used to clean(fix) an awesome pot, frying pan, or restore 30% the durability of a grinder. Melamine sponge can be made from, for example, 20 milks + 3 diabolic acid + 3 Humbabol.