It can depend on the bow a bit. I have seen a slight difference from left to right wing on certain Hill style longbows. Wtih cedar shafts for left wing with my Jojan fletcher, I rotate the nock, counter clockwise an 1/8th turn and tack it with hot melt. Then after fletching, I rotate the arrow to realign the nock to the cock feather and thus realigning the wood grain to 90 degrees to the the string. Right wing in a right hand bow with a Jojan does not need rotated, but the quill may tag the index finger on the bow hand with some bows. If I do not rotate the left wing there is a slight difference in the bow clearance because the bottom feather is more verticle, which reqquires a slightly higher nocking point. Then, with the higher nocking point, when shooting right wing arrows, the arrow wants to be nocked a bit lower to be perfect.