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I have an office chair where the locking mechanism needs tightening. I think the right way to do it is turning this nut, but the problem is that the space is so tight that if I get an adjustable or open-end wrench in I can't turn it. Is there some kind of specialist tool for this kind of job? I think some kind of very thin open-end wrench with a ratchet on the open end could be what I need, but they seem expensive and hard to find.

EDIT: As you can see in the image, it is a very tight fit with an open-ended wrench and there are some metal rods the wrench hits that limits the range of motion even more.

enter image description here enter image description here

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    Looks to me like there's enough room for an open-end wrench to operate. The trick is to flip the wrench 180° with each stroke to change the approach angle of the jaws.
    – isherwood
    May 12 '20 at 19:18
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    I agree, but to be clear, not an ADJUSTABLE wrench, you just need the simpler fixed opening type.
    – JRaef
    May 12 '20 at 19:23
  • An open-end wrench with different angle offsets at each end will work - my favorite Snap-On ones would do fine...
    – Solar Mike
    May 12 '20 at 19:51
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    @SolarMike, no, not a different offset at each end ... most open end wrenches are angled ... use the same end, but flip the end over
    – jsotola
    May 12 '20 at 20:03
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I would propose that you go to a pawn shop or thrift store and get an open end wrench.

You could then grind away as much of the sides or the shoulders as you can but still leave enough so that it is structurally sound. ( will not bend )

If you do not have a bench grinder then clamp it to a work bench and use an angle grinder.

OR, try a universal style wrench,

enter image description here

This kind fits over the nuts and allows you to tighten it in one direction and then rotate it back without having to take it off of the nut. You may need to grind it as well.

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Ask your friends if they have a flare nut or line wrench set. If not you may have to buy a set just to have them. They have an open end but instead of just 2 flat sides they have 6 or 12 points so each movement to turn the nut requires a lot less rotation.

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