So the manual says the maximal size of the mogos is 13”. Is that the size of the coloured portion? If so what is the size of the black portion beneath that? I believe that would be the part you would actually grasp.
The answer to your question can be found in Appendix A of the game manual.
Page 10 to be specific!
The appendix isn’t loading properly for me. Would you be able to give me an actual measurement? Thanks!