I follow the OB one Kanobi method...."Use the floss Luke"
Dental floss makes great (and cheap) nocking points.
Whip it in the bottom nocking point first and shoot a few shafts to make sure you have it in the right place. If it needs to be moved simply cut off the temporary nocking point and start again.
When you are happy, whip the top one on and then gently melt the floss.
I don't think the flavor of floss matters.
The other advantage of floss is that it gets in between the gaps in the serving and grips so it doesn't slip down the serving.
Cheap, quick, easy and reliable....works for me.