Answer:
Used to keep prisoners silent and to make temporary repairs on cars.
Cycle Cycle Cycle.
My second is performed by my first, and it is thought a thief by the marks of my whole might be caught.
When I type I tap these on the keys
What goes up but never goes down?
When is it bad luck to see a black cat?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?