the simpler way to recover the line leinght is to compare the center line on the back lines
put the depower and trim of the bar on maximun power,
starting to the bar, the backlines starts from the bar with a 3 konts trim, put it on the center knont,
then lock the end of backlines on a nail or any similar stable point.
with the help of a friend who takes the bar pulled take the measure from the ending of the centerline until the nail where the backlines are connected.. i think then you have a +-1cm accuracy leinght of the v lines.. !
after replacing of the v lines put all 4 lines of the bar again on a nail. and then trim it again with all 4 lines at the same leingth when the bar is on maximun power,
using the knots on the backline start of the bar you can tune again the bar..
i hope i was helpful!
sorry my bad baaaad english!
e remember...
NO WIND.... NO FUN!