The tensegrity table has a centre cable that has a maximum of 6.8kg that can be applied to it. The crimps should be able to handle a similar about. However don't place anything near this weight on the table otherwise it will break. The cable is under tension and this can be surprising high as all the outer cables will be pull against the centre cable.
We do sell spares for the tensegrity table.
You can buy the centre cable here
https://www.stirlingengine.co.uk/d.asp?Product=CENTRECABLE
If it broke and you think it shouldn't have (faulty). Contact us and we can send out a spare.