The Official Online RBS 6 Nations Store is open. The store has everything you need to get behind your team during the RBS 6 Nations, plus the store is now fully stocked with a much wider range of rugby merchandise.
But it was Knoyle, who plays his club rugby with Scarlets, that really shone as he constantly looked dangerous sniping around at the base of rucks while delivering excellent service to his back-line.
Fly-half and captain Felipe Contepomi nudged the visitors in front with a penalty, having already missed with another effort and a drop-goal, but that was as good as it got for the Pumas in the first half.
Two tries in quick succession after the half-hour mark turned the game very much in Wales’ favour as Powell, recalled for the injured Ryan Jones, charged over after a smart break from Knoyle.
And soon after they added a second as Wyn Jones managed to keep pace with North after the 19-year-old had scorched into the clear to take his pass and touch down under the posts, Hook adding the extras for the second time.
That meant Wales were 14-3 up at the break and when the Welsh fly-half added two penalties and Juan Martin Fernandez Lobbe went to the bin soon after half-time they seemed to be out of sight.
But back came the Pumas as Contepomi added his second penalty of the afternoon to make it 20-6.
Warren Gatland then rung the changes but there was still time for North to crash over after receiving a clever inside ball from Jonathan Davies.
Argentina then added a deserved try of their own through Martin Scelzo, the replacement prop barging over off the back of a rolling maul.
But Hook added a penalty late on to seal Wales' morale-boosting win in their last game before their opening World Cup clash with South Africa on September 11.