Thanks, riarcher. You can pretty much see how the nock is oriented-you want the flat plane of the feathers to be vertical when the arrow is on the string. Those traditionally aren't fastened in the center, but you could glue them if you wanted to. If you tie the tips on so that the feathers are hanging off the nock end of the arrow, then fold them forward so that the dull side of the feather faces out, you can get them really tight to the shaft without glue, especially tailfeathers.