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Arctic
(Trader)
It is always closed around the thread.

We want to open it so we can open the door then adjust the clip to work all the time.

With the lock inside there is not much room to flip this clip open, today i tried a trick with a 5p coin & a 1p coin.
Imagine the clip is locked round the bar inside the door as here below.

Armed with the coins 5p or 1p which ever you have.

Use either coin and insert it into the clip from the rear.

Now push the coin forward as far as you can, it will pop open the clip tried it a few times and worked every time.

Here is a little video using the coin the the bench.
https://youtu.be/91ew3Ws17IM
ARCTIC