Well, I'm probably gonna catch flack from somebody if I tell you... But I'll tell you.
It's what I do when my nocks are too tight. I put a pan with about a half inch of water in it on the stove and get it to a pretty good boil. Then I dunk the ears of my nock in the water for 15 seconds or so, then snap it on and off the serving a few times. The hot water softens the ears just enough so the string can spread them out.
Supposedly, the nock should be just tight enough to suspend the arrow from the string, but loose enough so that the arrow will drop when you thump the string. I like mine just afuzz tighter than that though.
Some guys make all kinds ofhandsigns to ward off evilwhen they hear that, andsay doing the boiling water thing deforms the nock and ruins your accuracy. Well, I've been doing it for years, for both hunting and tournament arrows,and never noticed any accuracy problems.
One thing though... It works like a charm on most glue on nocks, and the transparent type push on nocks. Doesn't work worth a flip on the other push in nocks made from the kind of plastic they use for those that come on Gold Tips. That must be a high heat type plastic they use on those.