What type of knot do you use with the floss. I couldn't get the floss to hold up. I also use the rubber tube type peep. You said the peep could be served in, how???
Don't use dental floss use serving material, you can get it at just about any sports store. To serve in a peep you serve like a normal serving for about 1/2 inch below peep till you get as close to the peep as possible with the tool you have, strip out about 6 inches, wrap around perimeter of peep(in the groove), strip out more if needed and wrap from above peep to peep for about 1/2 inch. You should end with 2 tails one above peep and one below peep, using an allen wrench to tie tails to, pull as tight as you can (Note: You should be pulling toward the peep from both above and below, this squeezes the peep from both sides), clip tails leaving about 1/4" and burn to bring flush and lock serving in place