The TDI sl machine Whites came out with was never offered a "real" handle like the original TDI and PRO models. Instead Whites used an "S" handle a cheaper handle that is lighter but less ergonomically correct for the wrist and caused much discomfort and fatigue after prolong usage . The problem is with the original "S" handle the coil weight is now placed on the top of the wrist , and after time this weight forces the wrist to turn down toward the ground .With the new mod the upright "joystick" is a lot larger and more padded to accept the hand and because the coil is now pulling more on the elbow and shoulder together thus keeping the wrist more neutral.
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