Ok, I don't know if this is really a secret or not but I am rebuilding my Golf bag on a budget after unfotunate events forced me to sell my clubs that I worked hard to get and were finally just right for me, anyway I purchased a rough cosmetic condition 910F 13.5 Fairway. The shaft and adapter that it came with were really messed up so I figured I'd be in for buying a new adapter, until I had a thought (everybody ran away when they found out I had a thought lol) but I decided to try the 915/TS adapters that I have and low and behold the Driver adapter actualy fits and works. then i noticed that the 910F adapter and the 913/915/917/TS Driver adapter are pretty much identical in length and girth the main difference is the very tip where the 910 is a bit deeper or thicker where the Ring would be on the 915 driver adapter but the play or wiggle room in the hosel itself is the same no more or no less they both tighten up normally and haven't hit a ball yet (NY winter right now) but the swing feels solid doesn't feel any different. I have searched all over and didn't see anything online telling this little possible gem of info so I thought I would share for others who may be in a tight spot and need a way to keep there club in the bag.