A couple raps of masking tape works well, i use a thin cutoff wheel on a 4 1/2 " grinder. I cut in the middle of the tape so the next piece is ready to go. I do leave the tape on to install the fitting to contain the braid so it doesn't fray, after starting remove the tape and continue install. I think which ever way you do it,it is most critical you flush the lines out throughly.It doesn't take much to jam your needle/seat in your carb and you sure don't want that crap in your oil if your plumbing a oil set up.