Took your faucet’s aerator apart to clean it? Trying to figure out how to put it back together again? Internet absolutely no help because it tells you that you should have noted how it came out in the first place? Yeah, I’m with you, pal, and you’ve come to the right place. This is how. Click on the photos for larger versions.
First, I numbered everything so I could refer to them (this is also the order they go back into #1):
The part I got hung up on was where you put part #3 into part #2 first, because it seems like it’d block all the water. It goes in like this:
Then stick that in part #1:
Top it all off with part #4:
Put part #5 on top, screw it all back into the faucet, and you’re done.