Is there a (slightly) flexible version of something like this:
Yes, there is. It's called a hose clamp, e.g. https://www.westfieldfasteners.co.uk/HoseClip_Mikalor_Supra.html
Thanks
@svenhöek started
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Yes, there is. It's called a hose clamp, e.g. https://www.westfieldfasteners.co.uk/HoseClip_Mikalor_Supra.html