Hi Blackwater ... I've never seen leaf springs with zerks - interesting. What I do find fascinating are the apparent myths and legends around the demise of wrapped and lubricated springs:
FAQ Eaton Detroit Spring Engineering Forums (TIPS) circa '12I am baffled by the idea that lubrication could somehow break down steel. But I have indeed driven vehicles with 'dry' leaves for decades - so was lubrication ever needed in the first place? Never gave it much thought until I started working on a forties era car.
regards,
stock49