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Easiest thing to do, if already stripped and over-loose, is to create a pseudo rawl plug by cutting a common dressmaker's pin down with a pair of wire cutters. Stick this, pointy end out, into the threaded hole and re-insert the allen-headded bolt. The added thickness of the pin forces the bolt to cut deeper into the plastic opposite. It's just like sticking a wooden match or two into a masonry hole before inserting the bolt. In fact, if you're more comfortable, do that instead - use a wooden match split in half or thirds inserted into the treaded hole and cut off to length. Certainly good in an emergency rather than using sticky and permanent epoxies that make undoing the whole thing a pain.
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