Hub centric

You can actually install uni-lug wheels without any washer.

I'd not advise tightening them down though, as the nut will dig in to the finish.

However, it allows you to see how the physics works.

By the time the third nut is on, it's centered.

They can only go on one way- centered.

The washer was mainly cosmetic, to cover the remainder of the exposed slot.

Because the washer was elongated, it tended to bend.

I ran my uni-lug Cragars with regular round washers.

MUCH stronger.

Brilliant design, really. Although I totally get why they can impart an uneasy feeling.