Quickest and simplest way to calculate the DH Tony is to subtract the numbers and double the 2nd number......
7-1 = 6 by 1x2 =2 ...so 6/2 or 3/1
another example 7/2 becomes 7-2 =5 over 2 x 2 =4 , so 7/2 becomes 5/4
Easier to quickly create a new price and saves messing about with stake adjustments.
Nice winner , best of luck