Well it sure would be nice if they were repairable.  Bill L. believes
they're done.

I know this much the washer you showed is on both sides. Meaning the left
shifter non indexing as well as the right rear deaurailler shifter. On the
left you can rotate it 90 degrees to change the pull ratio from a double to
a triple. I fiddled with that ring on the right and sure enough the shifter
had more range of motion. But when I counted the clicks (there should be 9)
the middle was smooth, no clicks, which led me to believe the finer more
intricate mechanism was stripped. So I decided to ask whether it was
repairable?

On the bright side, even when the indexed part fails like you did by just
switching to friction you can still get by. With my old MTB rapid fire
shifters when they went they went.

On Oct 12, 2016 9:37 PM, "dougP" <dougpn...@gmail.com> wrote:

> A couple of years ago the indexing got imprecise on a couple of the most
> commonly used positions so I switched it to friction.  I'm guessing some of
> those little tabs are worn.  Used to be when you disassembled the old SIS
> shifters little bits of broken plastic would fall out.  I just never took
> my current ones apart to see what the problem was.
>
> dougP
>
> On Wednesday, October 12, 2016 at 8:12:49 PM UTC-7, Hugh Smitham wrote:
>>
>> So yours is broken too?
>>
>> On Oct 12, 2016 8:09 PM, "dougP" <doug...@gmail.com> wrote:
>>
>>> This may be it:
>>>
>>> https://www.modernbike.com/shimano-sl-bs78-rear-shift-lever-boss-cover
>>>
>>> But this doesn't say how many speeds.  It does say what levers it fits.
>>> When Shimano first brought out SIS, those little tabs inside these washers
>>> used to break off.  Bike shops had bags of them & just handed out
>>> replacements.  I haven't taken mine apart to see what's failed.  It could
>>> be some of the tabs are worn to the point of not accurately indexing.  Now
>>> I've got a project for tomorrow.
>>>
>>> dougP
>>>
>>> On Wednesday, October 12, 2016 at 8:03:10 PM UTC-7, Hugh Smitham wrote:
>>>>
>>>> Doug,
>>>>
>>>> I think that part rotates 90 degrees and changes the pull ratio.  The
>>>> part I think that's broken is the plastic ratcheted pieces. When I get home
>>>> I'll pull it apart and investigate.
>>>>
>>>> On Oct 12, 2016 7:56 PM, "dougP" <doug...@gmail.com> wrote:
>>>>
>>>> Now you've got my curiousity.  I'm thinking the wear part is the silver
>>>> plastic goodie that Bill mentions having to be in correct alignment.  It's
>>>> a loose part so it is replaceable.  Whether they're readily available is
>>>> another question.  On my 8 speed, I just switched to friction a couple of
>>>> years ago but admit having index would be nice.
>>>>
>>>> dougP
>>>>
>>>>
>>>> On Wednesday, October 12, 2016 at 5:27:48 PM UTC-7, Hugh Smitham wrote:
>>>>
>>>>> And to my understanding not replaceable.
>>>>>
>>>>> On Oct 12, 2016 5:27 PM, "Hugh Smitham" <hughs...@gmail.com> wrote:
>>>>>
>>>>>> I wouldn't even know where to start looking for that? Nor what that
>>>>>> is. I think the issue is the small internal ratchets.
>>>>>>
>>>>>> On Oct 12, 2016 5:17 PM, "dougP" <doug...@gmail.com> wrote:
>>>>>>
>>>>>>> Is it possible to buy just the indexing washer?
>>>>>>>
>>>>>>> dougP
>>>>>>>
>>>>>>> On Wednesday, October 12, 2016 at 10:43:05 AM UTC-7, Hugh Smitham
>>>>>>> wrote:
>>>>>>>>
>>>>>>>> Very often people rotate the shifter base by 90 degrees by mistake
>>>>>>>> because the shifter has been on and off its based several times in its 
>>>>>>>> life
>>>>>>>> and people just lose track.
>>>>>>>>
>>>>>>>> I tried that Bill.
>>>>>>>>
>>>>>>>> Sounds like the shifter is shot.
>>>>>>>>
>>>>>>>> ~Hugh
>>>>>>>>
>>>>>>>> “Life is like riding a bicycle. To keep your balance, you must keep
>>>>>>>> moving.” ― Albert Einstein
>>>>>>>>
>>>>>>>> http://velocipeedemusings.com/
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> On Wed, Oct 12, 2016 at 10:40 AM, Bill Lindsay <tape...@gmail.com>
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>>> The internals of a shimano indexed barcon shifter are not
>>>>>>>>> repairable.
>>>>>>>>>
>>>>>>>>> 1.  What model exactly is your shifter?
>>>>>>>>> 2.  exactly which index positions are missed?
>>>>>>>>>
>>>>>>>>> The answers to 1 and 2 might imply a setup mistake.  Very often
>>>>>>>>> people rotate the shifter base by 90 degrees by mistake because the 
>>>>>>>>> shifter
>>>>>>>>> has been on and off its based several times in its life and people 
>>>>>>>>> just
>>>>>>>>> lose track.  The base piece fits onto a square protuberance on the 
>>>>>>>>> shift
>>>>>>>>> pod.  The shifter itself has a round recess with a single rectangular
>>>>>>>>> keyway.  The corresponding round feature and keyway on the shifter 
>>>>>>>>> base
>>>>>>>>> must be oriented correctly.  The correct orientation has the keyway
>>>>>>>>> pointing DOWN towards the ground, tilted slightly towards the REAR of 
>>>>>>>>> the
>>>>>>>>> bicycle.
>>>>>>>>>
>>>>>>>>> If you are missing random middle shifts, and are not missing one
>>>>>>>>> end or the other, then this setup error is not your problem and your
>>>>>>>>> shifter is just shot.
>>>>>>>>>
>>>>>>>>> Bill Lindsay
>>>>>>>>> El Cerrito, CA
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Wednesday, October 12, 2016 at 10:30:49 AM UTC-7, Hugh Smitham
>>>>>>>>> wrote:
>>>>>>>>>>
>>>>>>>>>> I have a right dura ace bar con shifter that misses some of the
>>>>>>>>>> index positions. It works fine in friction but I like my index. Does 
>>>>>>>>>> anyone
>>>>>>>>>> know whether the internals are repairable?
>>>>>>>>>>
>>>>>>>>>> ~Hugh
>>>>>>>>>>
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