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[feeutfo]

there wont be any stones there now, as the relevant section of spring has snapped off.

Anyway, best of luck with these ones.

[Andy H]

Not discounting the effect of trapped stones (in fact they probably make it worse) but:

My theory is that single rate springs share all the flex over the whole length of the spring.

Rising rate springs use the thin tail to react to small bumps in the road (the type where there are thousands in every mile of road) while the fat section of spring reacts to the big bumps and/or when heavily loaded. The net effect is that the thin tail fails through metal fatigue long before a single rate spring would.