So I have this old spin doctor pro bike stand. THIS IS NOT THE G3. This might even be the original version. I'm trying to sell it on Craigslist but I cannot remember how to get the clamp to hold tight. Anytime I search online it just brings up the G3 witch is the newest version of this stand. I'm on my iPad so I cannot upload a picture right now but if you know anything about these stands please post up.