Help with Thumbstick-template example and Instance Variables

Making a smooth thumbstik for my space game has proven difficult. Trying to follow 3 different examples - thumbstick movement, direction, acceleration...well....i need a drink.

Right now i'm trying to get the thumbstick example from LittleStain and i see there are a number of instance variables associated with the 'thumbstick', such as:

And i'm wondering, do i need ALL of them? There are 4 different movement behaviors in the example: Bullet, Car, Platform and 8 Direction. I only want to use the bullet behavior (i think).

Thanks for any help and insight.