Of course he didn’t (YouTube). Instead, he wrote a simulator that lets him try out various custom linkages in real time. It’s a Windows-only application (sigh), but it’s free to use ...

The four bar linkage is a type of mechanical linkage that is used in many different devices. A few examples are: locking pliers, bicycles, oil well pumps, loaders, internal combustion engines ...

although there are plans to expand the offering in the new Tier 4 Interim generation. Parallel-lift linkage designs vary across manufacturers, but in general are more complex than Z-bar linkages ...