I can’t remember who.. but I saw someone use a PBR beer can used as a shim to tighten them up.
I have used a wooden broom handle to re-form the legs to make them tighter.
My experience has told me that the more you move your kettle around in the back yard the more the legs wobble. If your socket welds are good then the aluminum leg tub is the weak link. Excessive moving of the grill or cleaning the grates like Godzilla will stress the legs and crimp them smaller.
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