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Internal diametral gear for servo

I can't find anything at all about an internal gear with a hole size. I need to determine the size (circle) of the internal gear itself in which I want the number of teeth.
I want it for a servo to create a gear inside a cylinder that I will put on the servo. Unfortunately, I can only find this, but here the size determines the number of teeth and the circle increases or decreases, which I don't want. I need more teeth for a smaller hole and this doesn't work in this case :(
https://cad.onshape.com/documents/f349bdd78c53f3325055aefc/v/1793e5bbc9a30d8b1b04a5ff/e/cde7a5f72f4aad3b6e6a7e4f
Comments
Hello. I've read your post 4 or 5 times but cannot grasp what you're attempting to do. Do you have any images you can post? Perhaps the document you are working in will provide enough information. - Scotty