Roomba 800 series roller bushing ball bearing upgrade

This is an upgrade to the Roomba 800 series roller bar bushings on the stock units. My dog's have very fine hair that was getting in between the bronze bushing and steel shaft, overheating, then melting the bushing holder plastic and causing a mess and general. This design replaces the bronze bushing with a proper shielded ball bearing, size F623ZZ. These shielded bearings should keep more contaminents out and outlast the stock bushings the Roomba ships with.

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