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It does sound as if you've got a stripped thread there (if you've still got the pieces, check the material. If it's steel, it's an insert; if it's aluminium, it's a stripped thread).
If you do need to drill and tap the hole and want to do it yourself, you'll need a pillar drill or at least a drill stand to ensure accuracy. If you've not got the equipment, you could try a local engineering firm who should be able to do something like this pretty cheaply.
Either way, you're going to have to remove the fork, if you haven't already done so.
As utopia said, for a temporary fix, you could fit a nut (and washer) on the end of the thread, but you'd need a longer bolt to do this.
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