I sent this question out to KHS this afternoon as well, and wondering what those of you with experience here thought. Here's the email I sent out:
"I own a flite 900 road bike and recently set it up on a bike stand to make some repairs. The clamp was designed to clamp onto the toptube. As I started locking it down, I heard two cracking noises and so I stopped. The force I applied at that point was very small. I inspected the area and found two long (3-4") but extremely thin (almost unable to see) hairline cracks on the very top of the top tube. I was wondering how serious this damage is, and if it was possible that i just cracked the paint and not the frame."
and here's a close up picture:
okay thanks guys for your time, really hoping i can ride again tomorrow.