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There is a cylinder with a spring inside. Presumably when the spring is compressed it will pull the external chain attached to it to be taught, I.e. not slack.

But I can't keep the spring compressed to then insert it back into the door cavity and faceplate on top.

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Here's a sketch of what I mean by the spring inside the cylinder.

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    is the spring compressed when not connected to anything?
    – jsotola
    Commented Jan 3, 2022 at 23:30
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    if the spring is as illustrated in your diagram, then the top picture should show a tensioned chain .... you are missing something ... the rectangular cutout in the door edge indicates that you are missing at least one piece
    – jsotola
    Commented Jan 3, 2022 at 23:32
  • Thank you @jsotola with regard to the missing part. I will consider carefully disassembling same mechanism on another working door to see what that missing part could be. I had disassembled the original door to be able to manoeuvre furniture and may well be able to identify that part in the same box where I stored the cylinder, after comparing with the working door.
    – therobyouknow
    Commented Jan 3, 2022 at 23:55
  • To answer your question is the spring compressed when not connected to anything. Answer is no. But when I push a screwdriver into the end of the cylinder I can feel the tension of the spring compressed.
    – therobyouknow
    Commented Jan 3, 2022 at 23:57
  • 2
    then you probably drew the diagram incorrectly ... the spring probably compresses when you pull the chain
    – jsotola
    Commented Jan 4, 2022 at 0:04

1 Answer 1

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Looks like I need to twist the chain to increase the tension, according to this Q&A: How to stop self closing doors from slamming

Thanks to jsotola for their input.

There is another faceplate, which I had while working on this, but not shown in photograph. But, as jsotola suggests, I should check for other missing parts.

Key things:

  • I was putting it in the wrong way around.

  • Need to use a chain stopper, clip to hold chain while fitting.

This video was key to my understanding too: https://youtu.be/P5SalSwsigc

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