jberks said:It will always be out by a mill or so, you only have to drive it down the road and back or just off the ramp. I suspect this is why they recommend weighting it down to remove the slack in the system, though most garages seem to get reasonable results without.
I had mine done a few months ago but the vibration at speed is starting to creep back so I may pop back for another front wheel balance and track check. I recon every 6 months isn't unreasonable for fussy buggers like me. (Normal folk probably have it done every 3 years or so!)