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
Perfect, thanks! Any chance you know what size?
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.
@Titch started
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A standard metric flat point grub screw will function