360 timing issue, retards before advancing?

I actually work in a parts store. Getting the Mr G springs shouldn't be a problem.

I'm trying to wrap my head around what's happening in the distributor when I rev it up. As the RPMs come up the weights want to spin outward causing the rotor to advance. The springs keep this from happening instantly/all the time. How can any combo of springs cause the weights to retract/retard before expanding/advancing? What am I missing?