maybe just try visualise whats going on in the suspension.
when you go over a bump the wheel goes up the spring is pushing down
if the spring is acting on the top of the upright through either the bone or joint in effect its clamping the assembly together the load is on the top spring mount
where the spring is is pushing down on the lower arm as the wheel goes up
the spring tries to hold the lower arm down and in effect is trying to force the lower swivel joint apart
thats why the lower swivel joints are quite specific
cheers les g
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