Oh damn. Maybe a strip out of a soft drink/beer can as a crush shim? And is there an alternative? Will Gen 2 wiper pivots work? Or someone posted that Volvo wiper arms fit our trucks - maybe the whole pivot pin and bushings will swap in with a little tweaking? I saw ready made threaded rods with heim joints/links on them in various sizes - it sparked the idea of using these for wiper linkages with a little grinding and mods on the existing pivot arms...

https://www.ebay.com/itm/1PC-Aluminu...97.m4902.l9144

They are available in M4 sizes as well. Not sure if you'd need to go M5 or what the availability is. But if your wipers are clunky adjustable rods and new heim joints will make them run crazy smooth (if the idea works)