Is there a correct way to install a lock washer?

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Types of Lock Washers

Lock washers are available in two basic types: spring action (or split) washers and tooth washers.

• Split lock washers are helical-shaped split rings. When fastened, the two ends exert a spring force on the fastener to create increased friction and resistance to motion. Helical spring lock washers are the most common form of a lock washer and are best suited to applications with smaller loads. High-collar lock washers are a kind of split washer.
• Internal tooth lock washers have teeth made to bite into the nut/screw head and surface it contacts. They work best on small screws or screws used in electrical grounding.
• External tooth lock washers (also called star washers) have teeth made to bite into the bearing surface. An external tooth lock washer is designed to provide stronger holds than internal-tooth washers as the teeth bite into a larger radius and are best suited to large screws.

When working with lock washers, consider that a tooth lock washer can leave scratches on its attaching surfaces. In addition, a tab washer is designed for harsh environments and has a tab that you can bend against the nut or fastener head to hold it in place.

Tip: Lock nuts are nuts designed to resist loosening from vibration or torque and are sometimes used as alternatives to lock washers.

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So I'm assembling a pull up bar and its assmebly instructions look like this

In the parts list it mentions only one type of spring washer (quantity 4).

But it actually came with two types of washers (quantity 4 each), type1 and type2.

Am I supposed to use both of them? And in what way? Any help would be appreciated!

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