i was at this local hobby shop that sells microsizers and slot cars and such and picked up some little springs that appear to be brass. anyhow there is little or any iron in them so they dont mess with the magnets. they are the perfect length and stiffness for this job i may ad. i think i picked up a few horses with this mod.
they were in some really cheap packaging. i dont remember what the brand was called. im gona try to turn one into a steering spring later on. ill let you guys know how it works.