With the back of the cam locked, the hub has a clockwise and counter-clockwise endpoint. When the hub is rotated fully clockwise, this is when the notch on the cam gear should line up with the notch on the timing belt cover.
Technically, when the cam locking tool is attached and the crank is in the right place, it doesn’t matter where the notch on the cam gear lines up. As long as the hub is in the fully clockwise position when you put the timing belt on, the notch on the cam gear can be anywhere and it wouldn’t make a difference. I opted to make sure the notch lined up because i’m stubborn and i preferred it to be that way, but you can always make your own mark/notch when your done.
To get the notches line up it is trial and error. snug (do not torque) the hub bolt and rotate the hub fully clockwise and see how far off the notch is. Loosen the bolt and rotate the hub until the notch is about 1 to 1-1/2 gears before the notch on the top cover. Torquing the center bolt will cause the hub to rotate slightly, so setting the notch a tooth or so before the notch on the top cover before torquing should hopefully result in the notch being nicely lined up once torquing is complete. Do this for both hubs.
To ease putting the timing belt back on and keeping all the marks lined up, i loosened the 3 8mm bolts on the cam gear when putting the timing belt on to get the marks completely lined up. When the timing belt was on and the notches were lined up, i rotated the cvvt hub fully clockwise as far as it would go. (at this point, because the 3 bolts are loosened, the hub will rotate freely from the cam gear).
I know some others might cringe at my procedure for doing the CVVT hub reset, but it’s worked so far for me and fixed my cam adaptation values in vida. Before the reset i had 22 degrees of adaptation on the exhaust cam, and 9 degrees on the intake side. After, i have about 5 degrees (within spec) on the exhaust cam, and .65 on the intake cam. I had good results and was happy i didn’t have to find an indy mechanic or a dealer like other people had suggested. There are guides out there to doing this, a guy called F250 on matthew’s volvo site has a good write-up for doing this procedure, but again, i just did it my way.