you can weld a mild steel tag to the end of the leaf spring if you grind the leaf metal back to shiny metal.
and here is my mk2 version with adjustable tension.
but there isnt enough surface area with two arms so im going for 4. and should have that welded up and running by dinner uk time.
as it is i adjust the tension so the bite point (stall ) is at say 5k rpm for 2 seconds and the bike is moving off but then it just slips to around 7k and stays there.
i tried softer springs to no avail. both are under the same tension - i measured the length precisely and got both the same. im hoping 4 leaf springs will cure the slipping. if not ill try weaker springs.