Help with modifying an existing part

Hi users,

The part below was created by a colleague so that by changing the curve radius the part remains the same length & the holes follow the shape regardless of the curve.  I'm trying to change it to suit another radius and coming up with some issues.

As below when I edit the Rolling Template sketch the diameter value does change, but the ‘Flex’ values in 'Structural Member' and 'Rolling' don’t change when I try to edit these for Ø7320.  The values don’t 'stick'. i.e. revert back to the previous settings of the original part .  Essentially the part is unchanged even though the sketch is modified.  Any advice would be much appreciated, thanks!