I have the old style Dillon powder measures with the return springs instead of the return rod. I recently broke my last spare spring and couldn't find a replacement on Dillons' site. I found an alternative at McMaster Carr. They sell extension spring stock (PN-9664K43 0.125"OD x 0.0018"wire diameter) in 36" lengths that you just cut to length and form your own hooks with needle nose pliers. You can make 7 springs from each 36" long piece. I bought two 36" lengths plus shipping for $20.41.
Hope this helps out some others.
Hope this helps out some others.