Advance springs

I should have mentioned another important factor in the spring force is the length, although I think you already figured that out.
The amount the primary spring has to be extended to get installed is what creates the force holding the weight from moving outward.

I may have some more pictures if needed. Certainly have some measurements of factory springs.

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edit.
I detail what everything does in the posts here along with some photos of the factory springs
https://www.forabodiesonly.com/mopar/threads/lets-revisit-timing.499590/post-1973587639