1. A method of swaging both an upper suspension and a lower suspension to an actuator arm for use in a disk drive suspension, comprising: using a simulation model to simulate the effects of swaging said suspensions to said actuator arm; identifying relevant geometric parameters of said suspensions; performing a parametric analysis using said identified geometric parameters; for each suspension, performing a linear regression to fit an equation containing said geometric parameters to a normal force of said suspension to said actuator arm after said swaging according to results of said simulation model; identifying a desired range of difference between said normal forces; using said desired difference range of said normal forces and said equations for said normal forces, solving for values of said geometric parameters to produce a set of target geometric parameter values; providing a suspension having actual geometric parameters that approximately equal said target geometric parameter values; and swaging said suspensions to said actuator arm.