I believe that's the key knockman "spining" the tire on the wheel so that the heavy spot on the wheel and tire oppose each-other. That is precisely what the "road force" balancer will tell the technician.
-Jared


-Jared

'00 Trooper S 4x4; OME 912 Coils; LT265/75/R16 Bridgestone Dueller A/T REVO's (Love'EM!)