GETTING THE GREEN (MAT UP)

When the mast has been placed well up the green it is very easy to find your new aiming line.

(1) You know your bank point which will give you the correct green on that side

(2) Go to a normal mat position one to two metres from the tee (in most games of bowls most ends are played with the mat one to two metres from the tee. Unless the mat goes up more than four metres the difference in aiming point is not worth considering)

(3) Sight the line to your bank point

(4) Observe how far away from the middle of the back of the new mat position this line passes

(5) This is exactly how far your bank point moves in for the new mat position

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GETTING THE GREEN (JACK OFF CENTRE)

This is not as precise as the change for mat up

(1) You know your bank point which will give you the correct green on that side

(2) Sight a line through the new jack position to the bank and get the point this line hits the bank

(3) Picture the distance x this point is from the rink number post

(4) Add or subtract this distance x from your bank point to get your new bank point

Geometrical explanation (for those who liked geometry at school). The angles a must be equal, hence the angles b must be equal, hence the lengths x must be almost equal and Y is almost equal to x