Hi Colin - thing is with the manual speedo they're used until they've worn out, then thrown away. It's not really the sort of thing most people hang onto - myself included.
Best bet - and this means reliability too - is to bite the bullet and order a new one. I think they're about £11 complete including the wiper disc, copper board and resisitors. At least you know you've got one that's not going to burn through in 5 minutes of racing.
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