"Not blown, but the plastic part had become so hot from resistance at the fuse-holder terminal that it had melted."
Small lesson there. Always use ceramic fuses. They dissipate the heat better and don't get shorter as they soften and so reduce the holding pressure.
I bet someone out there thinks a bit OTT using a Dremel, but a proper job needs a proper tool. Good for the box itself but a potential fuse destroyer unless you are VERY careful.
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