I find this simple triangulation works well for most kicks/banks. Personally I use an adjusted version that doesn't require building or visualizing 2 lines and then crossing them, I mentioned it in my articles that have been referenced before.
As Patrick said, technically to the rail track is the most accurate, but I just put my tip under the cushion to keep it in place when measuring with my stick. And once the contact point is found, assuming kicking, on the equipment I play on I will aim through the diamond at that point if shooting very slowly or medium speed with running english, and at the nose of the cushion if using a medium speed center ball kick. And of course you'll have to make minor adjustments based on equipment, closeness to the rail, and for angles at either end of the spectrum.
Scott
As Patrick said, technically to the rail track is the most accurate, but I just put my tip under the cushion to keep it in place when measuring with my stick. And once the contact point is found, assuming kicking, on the equipment I play on I will aim through the diamond at that point if shooting very slowly or medium speed with running english, and at the nose of the cushion if using a medium speed center ball kick. And of course you'll have to make minor adjustments based on equipment, closeness to the rail, and for angles at either end of the spectrum.
Scott