I followed the advice of the jolly logger and bearcreek. But there is always a bit of "art work" involved. How big of a face cut, how thick of a hinge, how much tigger wood to leave, which side to leave the tigger wood after borecut and cleaning out. Anyway not for the inexperienced. It was a bit anal scphincter tighten (because it was the first time attemting such a tree) but it work just as the jolley logger and bearcreek advised. Never saw a tree hit the ground so fast. Also a shout out to this site - I have yet to get bad advise. If I was not competent with bore cutting, it may not be as successful - need to know and acknowledge your own technical limits and not try to exceed them, or if your not dead, you will posting pictures of your cuts and broken bones,