bump, also the gear would not be able to have a shaft in the middle unless the shaft was already on the brick, this is due to the fact that a brick has a physical area of the studs around it, and when you have props they take up more physical space than you see, to explain this better, wrench a jcv hatch door and turn on rendering, you will see it's about a half cube, thats why you cant build up close to it.