yeah it's always a risk involved when dealing over the internet. Unfortunately I (we here in Sweden) don't have the luxury of having bike shops that can order track stuff, mostly because the sport doesn't exist here at all. I would definately use my lbs if I could but I can't. Instead I have Jim at Ben's Cycle to help me feed my interest in track bike parts. They're great!
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enjoy your worries, you may never have them again.