Rear derailleur problem
Comments
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I'd just disconnect the cable, and then shift the shifter to the highest gear/smallest cog position (you may have to pull gently o the cable), which you should always check anyway, and set it up again. NO real problem unless you cut the cable really really short!
RD tech doc: https://si.shimano.com/pdfs/dm/DM-RD0003-08-ENG.pdf0