Historically any attempts to change the subdial position on a 7750 have resulted in a reduced reliability and longevity. This is due to the Gear trains that they use to move the position of the sub dials. initially these gear trains were not jeweled and caused a lot of resistance leading to premature movement failure. more recently they have begun placing a couple of jewels in key points and reducing the friction. The other issue that would occur is by moving the chronograph sub dials, there was a high risk of having the gears slip and Skip upon reset, the end result being not all of your chronograph sub dials would reset to zero. What they've done with this movement is a eliminated the gearing for the chronograph sub dial so it's frozen. they've also reduced the number of Gears used to move the running seconds from the nine position to the six position. the end result is a movement that's almost as reliable is a standard 7750, and far more reliable than the older style modified 7750 that you would see in watches like the Daytona and the AP ROO.
You still can have some wiggling of the running second hand at 6, this is due to play in the geartrain and there's no way around it. it by no means indicates that there's an issue with the movement or redeuces longevity This being said while your base movement is a standard 7750, there is still a custom modifier plate present so the serviceability should something fail is not always possible. Overall there is several years of experience now with this setup, and the same basic setup is also used in the ARF Daytona.
