practice hard combo's dry.

[beul]

hey guys, i have a idea.. but i see this before, but i dont know where..
i want to make a thing so i can put my bike in wheely position to practice some combo's dry.
i know this sounds reaaaaaaly gay.. but i want to give it a go..
i seen it before, and i know more guys have made it..
its not a wheely simulator, just a mounting so you can put your bike at 12.. somebody?