£7, genuine (budget) shimano friction thumbie.
You can even bodge this onto a clamp or bar end or similar (obviously only as a backup). http://www.ebay.co.uk/itm/SHIMANO-Bike-Cycle-DOUBLE-FRICTION-GEAR-SHIFTER-Stem-Tube-22-2mm-BLACK-SLV-New-/141765226983?_trksid=p2141725.m3641.l6368
@tallsam started
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£7, genuine (budget) shimano friction thumbie.
You can even bodge this onto a clamp or bar end or similar (obviously only as a backup).
http://www.ebay.co.uk/itm/SHIMANO-Bike-Cycle-DOUBLE-FRICTION-GEAR-SHIFTER-Stem-Tube-22-2mm-BLACK-SLV-New-/141765226983?_trksid=p2141725.m3641.l6368