By the sounds of it...most people don't even know why a gyro is and with nothing more than a pretty picture of only the compenent, they never will. A video of a working gyro would be helpful - best if it's the hydraulic one but who knows if it really works yet...

This tool is indespensible when fixing steel bikes without replacable hangers - and every good shop should have one. Not so sure it's something the home mechanic has. The video was accurate, but bending back a cheap cast aluminum hanger will fatigue it and it will eventually snap - and likely when you least desire. It's best to just replace these ones. The more substantial hangers can be bent back but it's more likely they will break before they bend so you won't have any choice. The lesson here is how to identify that your hanger is bent. Replace the cheap ones and hope for the best with the others, but let a shop do it. It's a much cheaper option than re-spoking your wheel since this is where the chain usually goes when the hanger is bent. Sometimes you can't cheap out. The other option is to go single speed.

In the old days you bled the Hayes Mag brakes with one syringe that used a friction fit that could come off and leak brake fluid all over. Then Shimano came out with a simple system that you bleed just like a car system (although I have reservations about using mineral oil in winter). Then Avid came out with a system that requires two syringes, clamps and a repetative procedure...a huge step backwards especially since Avids require more frequent bleeding than once per year. I've owned all of them and the Shimano was certainly superior. Then I bought a set of Hope brakes and never looked back.