Here's my example: A piece of rod inserted into two servo posts
View attachment 508048these are regular alloy servo posts. Give a plastic set a try. Cheap and plenty to try. Put this between your ram and knuckle. Make sense?
I thought of aka "heim joints", and there are decent ones, but at 4 you're introducing 2 more pieces that can gain slop over time.
With the alloy servo post cut down a bit, and milled to width to fit your application, you can then take whatever M3 hardware and thread them onto the posts. Looks pretty and should be sturdy. Can be done with a file too!
Turnbuckles, pretty, but spendy
Just found this amazing item on AliExpress. Check it out!
$12.68 | Hobby Details Remote Control Vehicle RC Cars M3 Titanium Turnbuckle 2pcs/set