Dan: If I remember correctly, All of the early retrofits, Back when you took your solid mast to the dealer to be cut off and comptipped were the style that had the bolt hole. They seemed to come loose and rock back. You can look up the mast and see it tilt back at the comptip. At some point they lengthed the part that inserts into the aluminum and that seemed to solve the problem. I think I had my 84 boat done in about 88 and it had the new longer style. These are my recollections and could be wrong.