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The picture is of a device for pressure injection. It is somewhat stuck and I want to open and clean it, so that hopefully it starts to work again. I need to open the collar nut pictured. It has 4 notches that are like half moons. What is the appropriate tool for this? Link to the tool would be appreciated.

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    what does the user manual say?
    – jsotola
    Commented Nov 1, 2021 at 4:33
  • I've seen water filter wrenches that look like they might do the trick.
    – Steve Wellens
    Commented Nov 1, 2021 at 4:41
  • Make a C spanner or fully circular spanner.
    – Solar Mike
    Commented Nov 1, 2021 at 5:44
  • What's the overall diameter? Answers may depend on what tool will fit round it
    – Chris H
    Commented Nov 1, 2021 at 11:37
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    I’m voting to close this question because questions about repairing medical devices are, I suppose, technically withing the realm of DIY, they're not Home Improvement, and, frankly, I don't think we want someone's health potentially resting on our advice.
    – FreeMan
    Commented Nov 2, 2021 at 13:50

2 Answers 2

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A "bottom bracket wrench" might do the trick.

Park Tool model HCW-5
Image from Park Tool, model HCW-5, as an example

A "pin wrench" would probably work.

Harbor Freight adjustable pin wrench
Image from Harbor Freight - their adjustable pin wrench, as an example

If you won't want to go buy a tool, just put a flat blade screwdriver against the inside of one of the cutouts and give it a few gentle taps with a hammer. Driving it in the unscrew direction (lefty-loosey, righty-tighty) should loosen it enough that you can then undo it the rest of the way by hand.

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    That's great fodder for a whole new question @Bijan79. This is not a general discussion forum, it's a Question & Answer board. I must say, though, that since this is a medical device, it's obvious that someone's health depends on it. I wouldn't ask a bunch of strangers on the internet (no matter how well intentioned) about what kind of grease to use. I'd contact the mfgr & ask them. You may pay more for it, but you'll have the security of knowing it's the right thing and is not going to cause more harm than good.
    – FreeMan
    Commented Nov 1, 2021 at 17:26
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    None of us know the age or condition of this device, how critical some corrosion on the spring might be, how "strong" a replacement spring should be. I'm all for DIYing things, but I would not say "calling it a fix" is sufficient when talking about someone else's medical device. Get it repaired properly or at least get expert input from the mfgr.
    – FreeMan
    Commented Nov 1, 2021 at 17:29
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Strap wrench?

Strap wrench?

Rubber strap will not mar smooth metal. Circumferentially grippy. Not too expensive if it turns out to not work.

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