I was commissioned a little while back to work on this. The first one I made as a large bearing, and vibed like mad, no matter what I did. I decided to give it a shot using a ‘D’ size bearing. Turned out fantastic. Weights in right at 65 grams with the weight rings.
The hubstack and bearing seat are an aluminum insert
I decided that since this was a wide yoyo, it should have wider hubstacks, so I made a set that is longer than stock. I also made the center hole smaller like I do on my Ricestacks, and beveled the stack where it goes towards the hole in the middle.
Out of curiosity, did you give the first one a shot without rings? I find that mine is much more forgiving without them. And what are you looking to do with the botched one?