• Is it a standard size that I can get from a local hardware store or do I need an 'official' Shimano screw?

    A standard metric flat point grub screw will function

  • what size?

    No, but M3 or M4, so you can literally tell the difference just by looking

  • It's M4 x 8mm.

    Actual thing is on the left. I just tried the regular socket cap screw and it works fine, there's nothing anywhere near it that the larger head might interfere with.

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