Step 1
Position yourself over the head and hold the BOWLS EYE parallel to the ground with both hands using your thumb and index finger at either end, with your dominant eye look through the smallest inner circle of the device.
Step 2
Line up the inner circle with the Jack, moving the BOWLS EYE up and down until the inner circle is fully centred on the Jack.
Step 3
From this position assess the state of the head by using the outer concentric circles to easily gauge the position of the Jack in relation to the bowls.