This is not all my own work but it makes putting very simple. its the JC method but i always thought the explanations where complicated.
This is how i do it i look at my put and say its 10 foot +3 i take 3 from the 10 leaves me with 7
i put 7 in my calculator, then i look at one of the faster dots and i count how o long it takes to move across 1 grid. 6 seconds = 1 , 9 seconds = 0.75, 12 seconds 0.5 , 18 seconds 0.33.
so i take my 7 and multiply buy the number you just got for instance in this example its a 9 second read so 0.75 this gives 5.25.
next step is to go chip mode from behind and move the aimer so the vertical line of the box is over the pin this will give you the half distance of a grid. Then i take my ruler and measure the marker to the flag its normally 2 cm but it varies between views.
lets say its 2, so i multiply my 5.25 by 2 get 10.5 and i move my aimer 10.5 mm using my ruler hit the ding and it will go in.
For down hill putts you add to the distance so a 10 -3 will be 13. and also note when it comes to puts that are more than -4 work out what you think it is then double it
good luck hope this helps working pretty well for me if u have the speed of the dots right and you ding it goes in nearly every time