Building an Engine, Part 1

The Lego Technic line included parts to build a piston engine. While not functional, the engine does have nice aesthetic appeal and gives authenticity to models. So, let's start with the simple part: the piston.
---Today's Brick--
Name: Technic Piston Assembly
Size: 3 high x 1 diameter
Color(s) Several
The piston assembly consists of two parts: The piston head, which comes in different colors as you can see above. The head snaps onto the piston arm, which is the gray piece protruding from the bottom. This allows the piston head to swivel and move, which is essential for the engine operation. Tomorrow: the crankshaft parts.