I'm posting this video (the first video i've tried making; please be gentle). Fellow member Tom Albrecht has mentioned that it does not conform to the Consumer Product Safety Commission's guidelines for rattles. https://www.cpsc.gov/Business--Manufacturing/Business-Education/Business-Guidance/Rattles, so copy it at your own risk. To follow their guidelines would make the ball on the osage side much bigger and would, IMHO, make it aesthetically unpleasing. (like a small dumbell). Perhaps it would be best to advise parents that it is meant to be a family heirloom and keepsake and not to be left with the child unattended.
View: https://www.youtube.com/watch?v=tXo4wvT5buw