You can get screw/bolt extractors quite cheaply. Basically you drill a hole into the offending bolt, then screw in a thread extractor (which is left-hand threaded) which, once tight, starts to unscrew the stuck bolt.
@lae started
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You can get screw/bolt extractors quite cheaply. Basically you drill a hole into the offending bolt, then screw in a thread extractor (which is left-hand threaded) which, once tight, starts to unscrew the stuck bolt.