rmargiotta, I too have noticed that my center shaft wobbles a bit. I find the problem to be the front shaft assembly. I use the center one-way and noticed the one-way bearing doesn't sit exactly perfect in the hex and that is what causes the wobble. It doesn't seem to affect performance though, this car has been awesome since the day I got it.
I too am wondering about glowplug.com guy. He hasn't replied to my email either. Maybe he is busy? I don't know him, so I can't pass judgement... Anywho, I'm still on the look out for an aluminum front brace. Anyone make one up yet for sale?