I make my own small game/stumping heads from socket head 8/32 and a wingnut but doing some research and people keep referring to the "homemade judo" thread in the archives but I cannot find it with the search function or scanning the pages.
Can someone direct me there please

This?   https://www.youtube.com/watch?v=M_Gm5Zf9G9g&feature=youtu.be

That is definitely one way of it.  The thread specifically is what I was looking for and it seems to have gone missing.
Thank you for posting that though

That video makes a mean looking stumper.

I was bored yesterday and I made these up.  I have seen them done like this and slid over the end of wood arrows.  I took 357 mag brass and crossed two finish nails through them.  Then I used epoxy to attach them to 125 gr field points.  The first one didn't fly very well but these worked out perfect.