Okay, per Haydays request here is how I put these anchors together.
I took a crunchproof rivet and straightened it somewhat. It needed to fit into the 7/32” hole I drilled.
I threaded the rivet through and then a single link onto that. Smash that shut. I prefer a link at my cable to hardware/chain point.
The driver was sent to me by Golf ball.
Pretty self explanatory on grinding profiles to achieve figment to anchor. It was necessary to grind a bit of burr and rust from both sides of the section to get it to seat consistently in the slot of the driver.
I will make another driver head from a grade 8 bolt and it should be simple work with a cutoff skinny disk and grinder. That bolt will then be welded to my driver.