I've already got a gear that has its teets as in the picture:
I want to create the mechanism from the picture, but it's harder than I expected.
I think my gear is not the problem. But I'm not able to create the gray part, the gear anchor.
Is there any way to calculate the shape and/or sizes that matter for the anchor?
I tried a lot of things but I can't find the ideal shape for the anchor points that hook between the teeths of the gear.

[![enter image description here][1]][1]


  [1]: https://i.sstatic.net/h78sh.gif