Roomba upgraded CHM support bearing (and carpet upgrade)

Description

The Irobot Roomba (500 Series) Is A Good Robot, And A Helpful Roommate, But Suffers From A Weak Transmission. On Many Roombas, The Gearbox Fails Because Dirt, Fur, Pla Strands, And Other Debris Enters The Gearbox And Increases Resistance. This Is A Repair/Upgrade Which Addresses One Of The Primary Failure Modes Of The Chm/Cleaning Head/Gearbox. The Primary Failure Mode Is That Due To The Ingress Of Debris, This Resistance Gets Progressively Worse Until The Subsequent Heat Eventually Causes The Plastic Housing To Deform And Fail, Presenting Either As A Brush Box Error Or A Failure To Rotate The Main Cleaning Brushes. This Appears To Happen Primarily At The Two Output Wheels (Where Debris Enters) And The First Driven Gear, (Where The Rotational Speed Is Highest). This Is A Bearing Shim Which Fits Into The Chm Deck And Prevents The Metal Gear Axle From Moving Into The Empty Space Beyond The Chm Chassis. This Part Is Designed To Fit Precisely Into The Space Behind The Chm, And Will Align With The Edge Of The Chassis. It Is Designed With A Radial Cutout Which Will Allow Sufficient Range Of Motion For The Gearbox/Brush Motor To Effectively Adjust Its Height, But It Will Prevent The Motor Tab From Touching The Support Lug At The Bottom Of The Chm, Which Allows Proper Fitment, And Reduces Wear On The Height Adjustment Wheel And Bushing. This Part Was Designed Based On The Green Chm Module, But It May Fit Other Chm Modules (Black And Red). If Your Chm Has Not Yet Failed, This Part Will Prevent It From Failing. As Irobot Has Replaced The Older Chm Modules, The Only Other Repair Strategy Is To Replace The Chm With The New Grey Chm (~$50).

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