How big is the seat? 13" round? 14" round?
This stool is 12" round. Thanks for asking!
Bought this. What do i do withe the rounded metal and flat plastic washers?
The washer basically goes acts as a guard when using the screws. So when you're screwing in the screw, you should put the washer through the screw. Once it's all the way screwed in, the washer should be against the stool acting as almost a guard. Hope this helps!
Assembly for model B610
You can find the assembly instructions here: https://cdn.shopify.com/s/files/1/0240/6504/8681/files/B610_Instructions_rls.pdf?18202