The mechanism looks almost identical to the Suntour Barcon (of course) so 
broken Barcons might be a source of parts.  In addition the stem or 
downtube mounted Suntour power ratchet shifters might also have the 
spring.  See velobase 
The power ratchets might be found at a bike recycling place.  Here's a 
diagram of the barcon:
[image: NOS Pair 2 SUNTOUR Bar End Shifters BAR-CON Parts Pods Body Ratchet 
Covers Tour - Picture 1 of 8]

On Wednesday, September 20, 2023 at 6:17:05 AM UTC-7 

> Great idea about 3D printing, Peter! I'll reach out to Riv on the off 
> chance they can get me the file I need. 
> Our local library has a maker space with a 3D scanner and 3D printers, so 
> I can go get certified and see if I can make some stuff! It's about a 5 
> minute walk for me. 
> On Wednesday, September 20, 2023 at 2:37:23 AM UTC-4 Peter Adler wrote:
>> Sounds like a task tailor-made for 3D printing. The ideal situation would 
>> be if Dia-Compe would send you the 3D file that they almost certainly have, 
>> but I'm sure that (rational) liability concerns will prevent this.
>> Peter Adler
>> no longer professionally engaged in the 
>> rich-people-suing-other-rich-people industry, but still aware of the 
>> thought processes in
>> Berkeley, CA/USA
>> On Tuesday, September 19, 2023 at 8:02:06 PM UTC-7 Eric Marth wrote:
>> My plan, once I locate some pawls, is to make a Silver shifter repair and 
>> maintenance video.

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