I have played Titleist clubs for a long time and I always thought that neither of the driver, FW or hybrid adapters were interchangeable. But then I saw a post about Cam Young’s hybrid, that he was using a fairway shaft in it because the fairways and hybrid adapters are interchangeable. I questioned this but then I tried to switch the heads and they do fit perfectly in one another. I asked Titleist about this, and if it can be switched around and how it affects the increments in which you change the loft/lie. They just responded that they don’t fit in one another.. Which they obviously do. There must be somebody on here that knows everything about this. I would really appreciate a clarification.