Forgot about that but the derailleuer cables on touring and mountain 
bikes is quite flexible. Check your local bike shop, or on line places 
like Bike Nashbar or specialty Bikes.

Alan B. Pearce wrote:
>> But their thinnest wire (1/16") is not their most flexible. And their
>> most flexible, is at least 3/32" thick. Those are the best I've found
>> so far, but I'm looking for something thinner if possible, maybe 1/32"
>> or 1mm thick.
>>     
>
> How long does it need to be?
>
> I am thinking of the wire rope used by pushbikes (cycles) for operating 
> bakes and gear change. Also throttle and choke cables in (very) old cars. 
>
>   
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