After entering the valve stem position, you will be prompted to loosen the wheel and 
re-clamp at one half turn (approximately 180 degrees) from the current position. 
 
Press “Start” when ready to take readings. 
Once more, position the valve stem at 12 o’clock, and then press “Enter Valve Stem.” 
If the rim is centered properly, the following screen will appear briefly. 
 
The GSP9200 will then proceed to the “Balance” screen. 
If a centering problem is detected, the following screen will appear. 
 
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 3. Balancing Procedures  GSP9200 Series Wheel Balancer Operation Instructions