i would either run out to autozone and pick up a stick on balancer degree tape your your size balancer or . take the diameter of your balancer and multiply it by 3.14.
for example a 8 inch balancer would be 3.14 x 8 (8 being the diameter) that will give you the overall measurement of the outside of the balancer
25.12 then divide by 360 degree = .069778. that number is how many inches is between each degree . now times it by 30 (30 is your timing degrees you like to run) so 30 degree's of timing will be 2.09334 inches from your zero mark on your balancer.
im someone will tell you an easier way.
goodluck
3.14x8=25.12/360=.069778x30=2.09334