Leaf Spring in SolidWorks
Use side distance dimension
Make a full defined sketch. Reason: if your sketch not in full defined, you will face a problem to make changes in dimension. make sure your sketch in black bold, blue means not fully defined. Sketch exactly as i sketch. Note: you can control radius by two way, 1st: defined arc length & height or 2nd: defined arc length & radius, either way can. my example is arc length & height.
Use Extrude features
on same plane as Sketch1, draw a sketch2, draw an arc on solid edge, and make concentric the arc with solid edge. Set side distance from center of eye as in sketch below.
When you try to extrude, this pop-up window appear, click no and extrude it same with as before.
Use step 3&4 for next 3 arcs. Make sure you control distance from side.
In the end, when you change dimension, it should have no problem.