Is there an option for a joint on the end of dropped tie beams? The historic examples in my area show any other joint in the drop tie configuration has had to of been fixed at some time. Not all of them but most, they also far out number WHDT. Examples of fixes are the large iron staples, cables, and reenforcing nailed to the side of the tie and to the post. I have seen no repair work on WHDT, in other words they work where the simple through tenon is failing. How about in your part of the world. The only failed WHDT I have seen was the one I mentioned before. It had pulled apart I think mostly due to the structures state of being. Tim