• 4mm slot when fitted before the stem and it's fairly snug then, so it won't be much less than that when tightened, and cold rolled based upon your description.

    Are there better bike-specific choices, or should I head for the model railway shop?

    "Linishing": every day's a school day!

  • Are there better bike-specific choices, or should I head for the model railway shop?

    I had some turned, but I wouldn't go chasing after that as your solution. Maybe touch the shim with some of that coarse grit paper while you have it, but bond strength at the bung is going to be the key.

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