• Just for clarity here, the jockey wheel on the right in the pic above goes at the top.

  • I'm 1955 they were all available from Holdsworth Cycling Aids.
    Campag gran sport 75/
    Simplex 543 79/6
    Simplex juy51 43/9
    Simplex TDF 27/6
    Almost twice the price for the Juy51 over the Plain TDF and double again for the 543, they all seem to share the same materials and mechanisms.

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