If you take your thumb and your index finger and look right where they meet go ahead and do that now and relax your hand, you'll see a crinkle, and then a wrinkle within the crinkle, and a crinkle within the wrinkle. Right?

I personally obsessed about every nut, bolt and washer in these crazy things.

Use a dish washer if possible it consumes less water than manual dish washing.

Additionally, a plain washer may be used when the hole is a larger diameter than the fixing nut.