Might be a little bit off center of the topic, but if you watched the "Lock N Load" on the cannons, they used a couple of different methods of sighting the cannons, which seemed to work for the program. However, when it came to shooting the Mortar, is that a tried and true method, using a plumb bob on a string, lining up the touch hole, the barrel, and the target? That would give you a left/right line up, but then u have to figure elevation, amount of powder, distance to target, ect. Seems like too many variables to be an accurate method of sighting! BoomLover