If you happen to snap off the long skinny shaft:
Using an Eye Bolt to repair a broken alternator tensioner bolt
http://www.peachparts.com/shopforum/diesel-discussion/290803-stuck-v-belts-alternator-bolts-frozen-tension-bolt-broken-post2620258.html#post2620258

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84 300D, 82 Volvo 244Gl Diesel