You should be able to get the part code from the Shimano manuals and search for that. Hopefully it will be available on SJS eg https://www.sjscycles.co.uk/gear-spares/shimano-duraace-sl7800-stopper-washer-04mm-680-3113/?sessionid=a37ec82fe7bbaad6aa3353cb4831c2a63c2d8294
Yep, bingo, ta. Will get one ordered.
@atk started
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You should be able to get the part code from the Shimano manuals and search for that. Hopefully it will be available on SJS eg https://www.sjscycles.co.uk/gear-spares/shimano-duraace-sl7800-stopper-washer-04mm-680-3113/?sessionid=a37ec82fe7bbaad6aa3353cb4831c2a63c2d8294