[R-390] R-390 Coil Rack Springs?

[Dan Rae]

Does anyone know what material was used for the springs that are between 
the adjusting screw and the core itself on the R-390?  It looks like 
hard brass to me.  I have one rack where all four are either broken or 
looking fragile and need to replace them all.

I was wondering if my son would notice if I stole one of his guitar 
strings, that looks as if it might make a good alternative.

Dan
ac6ao / g3ncr