Got it, thanks
I tried it and found that the tape loved me more than the plumb bob, so I developed a solution: Items needed - scissors, square Post-it notes, 2" wide clear packing tape.
Basically, I make a "sandwich" of the post-it note, in the following manner-
Cover one side of the Post-it note, with the clear tape, except for the gummy edge. IOW, you want that gummy edge to remain gummy (because it will help you to secure the wrap in a moment).
With the Post-it note held with the gummy side vertically on the left, place the plumb bob, point up, and at about a 45 degree to the paper.
Roll the paper about the plumb bob starting with the upper right corner of the Post-it, until it is wrapped until only the gummy edge remains.
Press down on the gummy edge to help secure it to the paper underneath it, then take a 4" piece of tape (which should already have been cut and ready) around the Post-it cone you've now made, which will secure the seam of the cone - keep wrapping the cone until the Post-it is completely sandwiched. Cut off the gross excess, put the cone into the blowgun and determine how much more to trim it for a proper fit.
So what you've done is to make a cone (of the color of your choice) which is plastic-coated on both sides. It won't be affected by humidity or spittle, and will can be used over and over.