Seems like it was 2 3/4" behind the leading edge. Will update if I find it is different .
John
EDIT: I did go back and confirm it is 2 3/4" which also prompted me to go back and see if I told Peter the right value. It seems I told him 2 3/8" which is wrong. Please use the 2 3/4" point. I have on mine and it seems to work fine, very stable yet maneuverable.
John