Caster how to add some

[Ian Williams]

Something is seriously amiss if the leaf spring can overcome the radius arms and alter the caster that much, unless you don't have the radius arms attached yet?
Which incidentally is how I set the caster, attach the axle and spring first, make a spring seat wedge if required to achieve the caster you want, THEN sort out the radius arms. They are often bent and abused requiring fettling to fit, they should meet the ball on the crosmenber without any strain. If the spring is permanently twisted something was not right in the first place, if everything is put together under strain the shackles will wear out in short order and you will loose your caster.