Here is how i know when to wax my center serving .Thanks everyone, I'll try not be an over waxer!!
While you are shooting or after you shoot ,look at the end of the barrel and right where the string is ,at rest , there will be a bunch of wax build up in front and behind the string on the top of barrel . you will get some build up there , but it should not be excessive . if it is excessive then you are a over waxer ,LOL.
Keep that area wiped down after every shooting session , eventually it will go away ( the build up ) slightly after it does then wax the serving again .
The end of the barrel is where the string moves back and forth after the shot and wax comes out of the serving in that area ,more than anywhere on the bow , so in wrapping this up , when the wax is not building there , then there is no wax on your serving . Wax it .
Make sense ?