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You rotate it to adjust the caster, you bolt your thrust arm to the offset hole and rotate the puck to adjust, you can use it to let the LCA back a little to account for the shims which push the end out which pulls the arm forward.
So far I've only ever used OEM GT3 LCA style with two fixed holes so I can't say how much the solid style gives. I think RSS has a slightly better price for a pair.
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