Winding a new spring on the stud is do-able, but difficult without distorting the spring. Very limited room to work doing that process. Not near as easy as winding a spring on a pick-up roller rivet. As to derailing on curves, loose tire on the wheel, wheel not centered on axle (wobbles when it runs), wheel(s) out of gauge. I assume you removed a pulmor tire (bonded to the wheel) and not a actual traction tire.
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