Top Plate Spacers Question?

So according to headstrong and others, a 13mm or 1/2in top spacer plate amounts to an added 1 inch of lift.
1/4" = .5in
and 3/8 is about .7inches.
How exactly does that work? Why does it double? thanks guys

 

Im no expert but i think its due to suspension articulation...

(Physical thickness of the spacer/plate (inner)) + (the distance the suspension articulated downwards (outer) due to the added thickness) = total height of lift from added spacer/plate

I have a hard time explaining....but i think its a principle behind double wishbone front suspension.

Maybe someone else can explain it more proper.

 

If you consider the lower control arm to be a lever, pivoting around the bushings, the bottom of the shock attaches roughly half way between that pivot and the center of the hub/wheel. So if the shock lengthens by X the wheel center moves 2X. This is called a motion ratio BTW. Add a spacer to the top of the shock, you'll approx double the spacer thickness at the hub end.