Thanks for looking. I have available a set of replacement Wheels For Roomba 500 / 600 / 700 / 800 Series Robot Vacuum Cleaner. Salvaged and tested. Easy to replace. Unscrew 4 fixings on base plate and remove. Unscrew 3x crosshead screws on each wheel unit. Lift out and replace, then reattach the base plate. Any questions or queries, please shout. Set - 63
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