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Sounds like the bolts are rounded out?
Edit: Howard beat me to it.
Bolts available here:
https://www.sjscycles.co.uk/chainsets/shimano-ultegra-fc6600-clamp-bolt-washer-m6-x-19mm-1g3-9801/
Po
The pinch bolts do not tighten, they are also worn out the allen key will sit and once you attempt to tighten it comes right off