.....by looking at my new pen holder........
http://www.cardomain.com/memberpage/613816/13

Duh. :P

But is that really an upgrade?

supercharger pulley? i dont know, not that good with engines.

look like u did a pully swap and ur useing ur old or new as a pen holder.

That'* his OEM coupler. From inside the nosedrive.

thats on the SC right???? i'm an NA man. "Stop The Supercharged Oppression" (i quote from someone on here)

trust me with how ovaled that old one was it was a definate upgrade.....snout had like alomost a quarter inch of play before it moved the blades!!!! Makes a great pen holder with the addition of an old lost wheel lock key as the stand!!!! Anyone notice my high performance office phone??

IN the supercharger, not on it.

Mine was a tad oval, but not REALLY obvious. I've seen some bad suckers, so I'm glade you got it out of there.

what causes them to oval?

Drive belt torque opposing the rotors which want to remain stationary. Laws of physics

The pulley is driven by the belt. At the end of the pulley (input shaft) is a plate with 3 pins. On the first gear inside the gear housing are 3 opposing pins. Each set of three pins enters the coupler from each side, so the coupler has 6 holes. The plastic gives a little so you don't beat the metal parts to death when you romp the go pedal (next to the brake pedal).

It'* a flex coupler, designed to take the hammer blow.