Paris is a key cog in a line that is true to the 49ers' overall creativity and excellence on offense.

But I am one cog in the wheel, albeit a key cog.

The senior forward Norman Richardson, so often the key cog in Hofstra's offense, was a big part of the problem today.

He broke into the starting lineup in the sixth game of the season and never looked back, adding a key cog to an already potent offense.

And now he's a key cog in a Giants defense that's heading to Green Bay this weekend to try to dethrone the world champs.

He was a key cog on a stingy Bulldogs defense that held opposing offenses to 8.4 points per game in 1999.

Taylor was the key cog in two Giants Super Bowl championships, in 1987 and 1991.

In came backup Éric Lapointe, who would become the key cog of Montreal's offence in the second half.

And Ben Hayes shows up my ignorance of key cogs from the mid 60s engine room.

We lost a key cog in our machine.