Hello i have always used my carbtune to sync carbs but curious how do you do the drill bit technique to sync you V4 carbs?

The drill bit technique is a rudimentary means of aligning the butterfies up as close as you can without the aid of a carbtune, the carbtune is much better as you can phisically see the balance.
If you look through Cammo's thread then there is reference in there on setting up with the drill bit, I used this method and after checking with carbtune found it was slightly out.