That’s a great link - thanks for sharing it!
I used to lack a mechanical mindset that would help with ideating functionality. What helped me the most was analyzing complex products like power tools. Knowing how the parts are made (i.e. injection molding, overmolds, bosses), what the internals are, and how everything functions together when you use the product. Most importantly, understanding why the product is the way it is. If you train yourself to recognize these relationships, over time it gets easier to break down an existing mechanism into a logical process that you can use to inspire new ones.
Another thing that helped was creating Solidworks models of consumer electronics. You gotta take them apart and reassemble it. Google images help, but the robust learning comes from doing the hard work.
This probably doesn’t directly answer your “what’s your mech. sources?” question, but some thoughts to consider…