ActionScript 3 :: Implementing Frictionless Pendulum Using Rope Resource?

I'm developping a gameplay concept using AS3 Fisix engine in which I need for a pendulum to be frictionless. The idea is to define the head and tail positions (using the Fisix's Rope resource) by mouse clicking and dragging in the screen and let the pendulum swing so that it goes forth and gets back to its starting position without losing momentum, and keep doing this repeatedly.

So far, I managed to make the pendulum swing normally but still being affected by friction and gravity (it keeps moving until got totally still, like a real-life pendulum would do). After many trial-and-error experimentations, I realized that I couldn't find any obvious parameter to work with, either in FisixEngine instance or in the Rope object itself, which allows me to remove or disable the friction from the simulation so that the frictionless behavior could be achieved.