How to Clean the Front Wheel of a Roomba Discovery

Step 8 Remove a bunch of screws; try not to lose them

Remove the screws marked, keep track of where they came from. You can put the screw into ice cube trays like here, or just sit them on the counter with post-it notes. Explain loudly to everyone around how you know you should put the screws in ice cube trays, but you're too lazy, and they should be really careful not to knock the screws on the ground. This is especially true because it's the kitchen counter you're working on.

My Roomba is a model 4210; yours will undoubtedly be different.