For the time being I think we should just replace that collet with a better one from OSE. We'll have to cut the sucker off since the grub screw is rounded over but that's fine. If the shaft really is borked we can always grind a new flat spot into it and keep using it until your U-Joint disassembles itself. Flex shafts are much tougher than the stock setup but IDK about steering with one.