For the correct way to fit a Centre Lock wire wheel to a balancer see  http://www.mwsint.com/FittingCentreLock.asp

Do not use tyre shops 'everycar' universal balancing cones, we sell the correct tool / part - all you need to provide is the balancer spindle dia which is usually between 1.125" & 42mm, measured accurately from your tyre shops balancer.

1st photo shows how to fit the wheel on the balancing machine correctly , the 2nd photo is not correct & is how most tyre shops will fit the wheel to their balancer.