I've got a similar project in the works--Case Bowie blade needing a new handle, plus a piece of antler. Plan is for a totally-concealed-tang construction, though the antler is not a whole lot thicker than the tang is wide, so the antler may be pretty thin just above and below the tang in the finished product. Questions: (1) How important is it to have anything (like the "spacer" mentioned above) between the horn and the guard; (2) what are the pros and cons (apart from the obvious difficulty and expense) of supplementing the epoxy with one or more pins or rivets? (3) Any practical tips on drilling horn for a tang? (4) If pins or rivets are a good idea, where's a good source? (5) Any other good questions I should be asking, but haven't?