If you buy a break with holes all the way around like the KDF or Vias
then it doesent have to be timed.
But if its a break like the Holland or one of the custom breaks that
have the ports on the sides and the top but not the bottom
they have to be timed so that they are in the correct position.
Timing is done by cutting the face of the sholder back untill the
break is in the correct position.
Hope this helped
J E CUSTOM