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Interchangable rolls rolling mill

I bought a 80mm rolling mill with interchangable rolls for wire and
for flat sheet. i haven’t used it yet because i’ve got no book and
the gentleman i purchased it from Kiren said to call him when i’m
ready i’m just curious i saw there is a small metal spring laying on
the top of the machine where the heck should it go? where would a
spring be needed on a Rolling Mill?