Trav makes a good point, I don't fiddle with tubing very much anymore so I forget the subtle stuff.
Personally, I just use a TRU BALL nock aligner that weighs the same as a regular nock. Since I use a loop, I just put it on upside down and the peep will line up right every time. I like it better since there's no tubing to screw things up. OR I could be like Travis and quit being so cheap and buy the pliers for tightening loops.