We were the last builder to move from 18' to 19' hulls and tracking stability was becoming the driving force to lengthen the hulls. Our 19' Advance came out the following year in 1985. To be competitive with the others I had to come up with something else knowing the Advance was still in development. There was political pressures to not allow the A/S 18' to pass the towboat tests which preceded the 1984 model year based on tracking issues from the 1983 model year. The tests were subjective, we did not have anything to actually measure the tracking at that time. I came to the tests with our 18' Skier with a hidden feature that the testers did not notice before the boat was launched. Surprisingly to the test team the 18' Skier I brought them actually scored better than the other guys with their 19' hulls and they were dumbfounded, and passed the boat for the 1984 season. When asked what I did I simply told them I added a tail to the kite. When I pulled the boat out of the water later that day every boat manufacturer, ASWA official, and magazine writer were crawling under our boat to see what I did. The "T" fin was born and remained on all A/S tournament boats since.
It is attached with #10 machine screws with nuts, I have been pretty aggressive with a mallet to straighten these before, you have little to loose by getting aggressive to try & fix it.