Very unhappy customer (NST pulleys).

[Black_griffin6]

My theory is that the NST pulley is not balanced properly, which causes it to slightly vibrate and move when it turns.
The vibration although not severe at first causes it to break over time, especially if you do any spirited driving.
I could be wrong, but maybe that's what happened.

@ilikerice: How come you didn't say anything before? Maybe I just missed your thread in which you talked about it. XD
I'm glad i'm not the only one with a problem with the WP pulley.
I do know that NST had said not to post any negative comments on forums or social media, ect. They probably don't want a bad reputation.
However, if they sold me a solid product, there would be no need to tell me that kind of thing. >______>

[tooter]

Originally Posted by Black_griffin6

My theory is that the NST pulley is not balanced properly, which causes it to slightly vibrate and move when it turns.
The vibration although not severe at first causes it to break over time, especially if you do any spirited driving.
I could be wrong, but maybe that's what happened.

What you said about vibration makes sense. Also what could have accelerated the process is that the NST is one solid unit and has no way of absorbing crank vibrations.