Great. Thank you for confirming the size. The weight seems to be fairly snug in the cavity, with little more than a half inch or so around the edges. It almost seems like wedging this during transit isn't as big a concern as I originally thought (?).
I'm still baffled by the photo I posted. Those look distinctly like weights to me, but are in the wrong place. They'd be adding to additional need for counterweight, not reducing it... But, I guess it is academic. The other photo clarifies what I need to capture.
I'm curious why you are changing from LinuxCNC to UCCNC. I never completed my LinuxCNC conversion, but I may have to do the Dyna someday. I had assumed it would be to LinuxCNC again..... The Dyna is working with the Mitsubishi Meldas M3 control so I'm not seeing a driving reason to retrofit it right now. I'd certainly welcome people's opinions on why I should reconsider that position though. The main reason I'm avoiding an immediate retrofit is that I want to have some fun! I've been converting for years and I'm a little burned out. And, I'm not too sure if I could reuse the Mitsu drivers. They are all digital and I don't know if I could interface these to LinuxCNC. So a retrofit quickly gets out of control... Do I need to replace the AC servos too? That would be even more money... You get the idea. But we'll see. I will learn more over time about how the Mitsu M3 works and whether I like it, but I'm going to stick with it for awhile (one argh is that it is 3 phase only... I kind of like being able to run without a phase converter if possible).
This looks like it might be a suitable bolt:
https://www.amazon.com/Swpeet-Stainl...1&s=hi&sr=1-12