Don,t suspect theres alot wrong there as PD says ,reversing is covered by the shoes moving off centre to change dia ,you have a good photo record of how it go,s together ,for a succesful fettle just remove the cables , strip it out and get at it with an angle grinder with one of those awesome wire brushes on ,reassemble with copper grease or similar ,if your feeling really keen give the backplate a coat of cold galv paint , good luck
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