depends what alternator it is. Sounds like a Bosch. If its the bolt for the warning light terminal (stamped D+) They can be difficult to change as the 4mm bolt is glued and pressed into the rectifier.
Your local auto electrician can get a new rectifier for around £15 but will charge you for a full recon unit. If its nackerd anyways might be worth doing as you know it will work when you come to fit it back on
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