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It's possible to replace the pinch bolts. They are a weird size though IIRC.
If you were really desperate you could run a longer screw and pop an actual bolt on the other end...
You first step is to figure out if it's the bolts that are rounded, preventing you from tightening them, or if the threads are gone as well. Try threading a similar screw from the reverse side - I think they are M6 but will check.
Thank you for that but i need the 170 measurement which is proving difficult and expensive for an issue that i have been left with