KMOT, there is a wire 'V' shaped bridle that is connected to the car, then the string is tied to that. If you need one, let me know and I'll be happy to send you one. The geometry is kind of important in order to get the car balanced while it's running. I have two of the Testors cars that I run because they made so many of them, and can still be found at a reasonable price.
Yes, they are surprisingly fast! I have had only a couple of failures in the past; crankshaft sheared while the engine was free running, and the fueling nipple on the tank is kind of fragile.

I'm slowly working on getting an old Cox Gurney Indy car ready to run, should be interesting. Just so nobody gets excited, the stuff I run is generally in pretty poor condition. One of my Testors cars is so bad the body is held together with ty-wraps!! My nice stuff stays in their boxes.

Scottman, I like the website! I will be sure to check in with them.

The next time I go out with the cars, perhaps I'll try to get a video made.

John