Patent ID: 7077006

Claim:
In combination with a mid-centering device used in an off-vehicle spin balancer adapted for balancing a vehicle wheel, said mid-centering device comprising an elongated mounting shaft operatively connected to a balancer motor and extending outwardly from a motor housing, and a face plate fixed to the mounting shaft proximate the motor housing, and said combination further comprising a wheel centering member cooperating with clamping means to sandwich and dynamically center the vehicle wheel on the shaft, a high-accuracy wheel spacer comprising: (a) a base having first and second opposing major surfaces; (b) a plurality of outwardly-projecting spacer pins depending from the first major surface of said base and engaging a limited surface area of said face plate to space the second major surface of said base away from the face plate, whereby as the vehicle wheel is applied to said mounting shaft and urged towards the second major surface of said base, said wheel centering member penetrates a center hole formed with the vehicle wheel to dynamically center the vehicle wheel on the mounting shaft with said spacer pins cooperating with said base to space the vehicle wheel a predetermined distance from said face plate such that the vehicle wheel sufficiently clears said motor housing for free and unobstructed rotation by said mounting shaft.