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Is the thread really gone, or just a bit flat? Your local fixit shop might get enough thread back with the big thread-chaser to set the lock-ring in with a bit of locking potion. You would have to get it totally reamed to use a threadless. I've used a Royce unit for several years without it working loose, but it was a bit spendy.
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Julietty, you can fit a harry but you need to set about the inside of the clamp with a 10 or 13 mm parallel round file. Using your skill and judgement, start whittling away at the two obvious contact points which are preventing clamp closure, then generally enlarge the radius slightly. You would probably have to take a radgie on it to render it useless, and after all, they only cost a fiver. I might have had to fit a 10mm longer clamp bolt to span the gap, but it's on and working. Go on, go on, go on, go on- have a go! Bobfix
File option is good. I've done it with a Dirt Harry and a 13mm parallel round file. You wouldn't know it wasn't bought like that