Shimano band on front mech reducer spacer from 34.9 to 31.8?

DF33
DF33 Posts: 732
edited October 2012 in Workshop
Changing a tiagra front mech from a 34.9 sized bike onto a 31.8 winter trainer and need a reducer.

Anyone either know where I could buy one or anyone have one? Tried googling without success.
Had a look in the spares box to see if there was anything I could make one out of but nothing the right thickness.
Peter

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