That pic is straight from the Mary Rose trust. It's the one featured in Weapons of Warre.
For what it's worth, a lot of the top warbow makers today are experimenting with removable nocks. Both Steve Stratton and Dave Pim have made bows where the nocks aren't glued on at all. With a side nock like the one found, the cut actually goes into the wood of the tip as well. This means that the nock can be taken off, then placed back on when used. The string is attached via two bowyers knots and the groove made in the bow tip keeps it all in place unlike a normal horn nock which needs to be glued there.
In fact Steve is of the opinion that the strings were kept tied to both nocks at all times. The bottom horn nock would be slipped over the bottom limb tip, and the bow bent to allow the top horn nock to be placed over the top limb tip.