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I have to repair a Shimano STX shifter 7 speed (from a Raleigh MT200 bike from 1995). It has a broken spring, and I am almost sure that is the only thing to be repaired.

It is similar to that pictured in https://www.cs.hmc.edu/~geoff/deoredx/reductions/P2004.09.08-10.17.55-3814-labeled.02.html

shimano shifter exploded view

I found a disassembly of the brifter ST-EF28-Left. In this figure, the broken spring would be "Coil spring", I guess.

enter image description here

I would be happy to get a minimally invasive solution.

Is there any chance of getting the replacement part? Where from?

Otherwise, I would get a new shifter/brake, only right side. I found several options. Can anyone let me know which is the order from lower end to higher end?

Can you use a 8 speed Shimano shifter with a 7 speed cassette?

8 speed shifter with 7 speed cassette

Other useful links:

http://www.4bc.org/instruc/shimano/rapid_fire_shifter.html

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    I embedded the image, but there are three springs shown - which one? But in general, second hand shifters are cheap and you can probably find a working copy of your one, or just a replacement 7 speed shifter. If you get the same one you have spare parts, but that makes it harder to find the replacement.
    – Móż
    Jan 18, 2016 at 8:43
  • Gidday and welcome to SE bicycles. I think you'll be better off finding a replacement shifter. This one pictured is an indexed shifter, and mine cost around $35 NZ from the LBS. The only reason for fixing your one is if you're after pure originality. Your LBS may even have something that looks similar.
    – Criggie ♦
    Jan 18, 2016 at 9:34
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    My suggestion is to either buy the Altus SL-M310 (which is 7 speed) or a friction shifter. The ST-EF51 is garbage -- I had one for all of about 2 days before it started acting up. Microshift TS38-7 will also work but I don't know of the quality. There isn't really a point in servicing shifters beyond WD-40 flushing if necessary unless they're expensive or have sentimental value.
    – Batman
    Jan 18, 2016 at 13:21
  • @Mσᶎ - Thanks for embedding the image. Even though the picture does not correspond exactly to an STX, I am almost certain it is the downshift return spring. In the likely case of not getting the spring (which might be cheaper and easier to repair) I would get a part.
    – sancho.s ReinstateMonicaCellio
    Jan 18, 2016 at 22:01
  • @Criggie - I live in Argentina... Not that much variety, and prices about doubling+ Amazon/ebay.
    – sancho.s ReinstateMonicaCellio
    Jan 18, 2016 at 22:03

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