Thanks, all.
Scuba weights look like they could have worked if they nest together tightly enough. I had never heard of them before. Train track plates (I guess those connect rail sections?) sound heavy, but I didn’t know about them either. I guess I know where and to get some, but it might get me in trouble with the law. 😀
Yes, trying to get such precise dimensions is testing fate.
The only way I would surprise my wife with the head (and support talons) is if they were attached with tape so I could remove them after she started reacting. 😀