helping hands ball attachment

I have some cheap helping hands from Aliexpress, but they came with double adaptor ball joints, I wanted to have individual helping hands. So I replicated some.

The insert is to give it a little more strength, because you print the piece standing up for the screw threads, but this makes it a little weak along the layer lines.

I just force the insert in, its such a tight fit, I don't think glue is necessary. You might even just print the ball joint thing without the insert and it might be fine, your choice!

Its a pretty tight fit for my helping hands which I think are these:
https://www.aliexpress.com/item/4001003588878.html

I put the attachment into a wood vice and then I was able to push the hand onto it, but it takes a fair amount of force, but if I made it any looser, it would not hold its position.

I found this thing, which can be used (convert to a hole in tinkercad) to produce the female screw threads for the helping hands too.
https://www.thingiverse.com/thing:2269821