I made these 3 paint drawings to show possible ways they could go and asking, can someone please explain which one is correct? Engineering drawings they ain't, but I made them for simplicity, rather then me trying to explain with a whole bunch of words. The the more detailed responses anyone feels like saying I am all ears...only one of the 3 must be correct of course, so i call them method 1 2 or 3 -
Method 1?

Method 2

Method 3

The dots on the method 3 show that, the teeth would be inside the idler and not in the notch (both sets of teeth) So which method is correct of where the teeth need to go- ?