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  1. Looks like a M4 grub screw. I keep a selection of grub screws on my bench for just these reasons.

    If that’s the original screw, then something else may be missing from the clamp.

  2. step1makeart on

    That’s commonly called a grub or set screw in the US. Best place to find them is the bulk hardware bins at your local hardware store, or you can buy more than you’ll need in 15 lifetimes off amazon.

    Might be hard to find stainless in your local store, but worth a try. My local Ace only had black oxide last I checked, which will work, but is less than optimal over time in an area that gets a decent amount of water ingress usually.

    Tricky part is figuring out the thread standard. Ace generally has thread measuring devices you can screw your existing grub screw into. If nothing else, use to confirm before you buy online

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