Here is the Mathematical Formula to find the length it dropped.
cos A = adj/hyp
with A = 23.4(degree) rake
b = adj distance down
c = hyp 1"
working that out you would get a .92 on b(adj)
Thus working out to .92" which is almost the full 1" with the space Jefro states is free from the factory you could in fact drop it more than 1"