I have had the 910, & 913 drivers, and just recently purchased a used 915 D2 from a very reputable national golf shop. Went to the range to adjust the setting from D1 position when purchased to A2 (my preferred setting) with Titleist wrench. Took the time to be careful with the screw to "click" position. It locks, but the adapter, to the shaft does not lock in to the head. I always position the shaft grip vertically on concrete to adjust, and has worked for previous models. Comments please? Have there been other reported issues with this adapter? Can I get Titleist to replace the adapter/shaft (Diamana S regular)?

Thanks