I know I'm not the first one to come up with this, as a friend of mine told me about it, and I'm sure plenty of you already know this little trick... but for those that don't, I figured you might benifit from it.
My friend Curt showed me how he dips / crests his arrows - he gets his bow to his "perfect" brace height - the one it shoots best at, and then he puts the arrow on the sting and marks the arrow shaft where the brace height is. He then dips and/or crests the arrow to that point. This way, when he has an arrow nocked, and looks down at it, if the cresting line on the arrow isn't even with his brace height mark on his bow, he knows his string has stretched and needs to be adjusted. It's a quick "field" indicator to help you determine where your brace height is without carrying a bow square with you.
I hope this little trick is as benificial to someone as it was to me. I have been doing it for quite some time, and I just realized tonight that some may not know of this nifty little trick.
All the best,
Glenn