Changes

The back of the cylinder head is home to small hole and a black, rubber surface which absorbs the impact from the piston head. The small hole on the back of the cylinder head is the first step in channeling the air for “export” down the barrel. On the front end of the cylinder head is a small protrusion where the air nozzle is placed.

This picture contains both the cylinder and the cylinder head.

=== IIc. The Air Nozzle ===