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When I unscrew the front derailleur bolt to adjust the cable (wrapping around B and C), the entire parallelogram rotates.

Front derailleur bolt

Part A: What is the appropriate way to unscrew the bolt?

  1. Hold the parallelogram in place with a pair of pliers, or
  2. Just rotate. The hinges in the front derailleur are designed to take the torque for removing/tightening the cable.

Part B: True or False: Since there is threadlocker applied to this bolt, there is no such a thing as a minor adjustment (unwind a little, set the cable right, wind back). The threadlocker must be re-applied, and so it's anyway necessary to first remove the bolt completely.

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    I generally hold them with my hand and curses. (I wouldn't normally use threadlocker on the bolt.)
    – Daniel R Hicks
    Commented Apr 16, 2020 at 19:20
  • @DanielRHicks I'm not sure whether you meant "... with my hand and curse" (because it's too easy to pinch one's fingers), or you were referring to some obscure (bike) tool.
    – Sam7919
    Commented Apr 16, 2020 at 19:55
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    Cursing is an important skill for any mechanic.
    – Daniel R Hicks
    Commented Apr 16, 2020 at 20:43
  • 1
    @Sam I think he means "curses" as in more than one curse. Many, many curses are required.
    – Noah Sutherland
    Commented Apr 16, 2020 at 20:46

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Just push the cage inward with your hand while undoing the bolt. Use a wad of rag to protect you hand or wear a heavy duty work glove. If you use a pair of pliers you'll scratch the finish.

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