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The difference in color of the springs was for the amount of
tension/compression of each spring. I do not recall which
color went where on the table.
IIRC, the springs with the all black plastic top were from
the MKI, the black top with the three silver balls were from
the MKIII and the stainless steel tops were from the MKIV.
When I went for the Mk IV upgrade, my springs were all black caps with the three silver dots on top, but two were silver and two were gold. They were to go as follows... the two silvers in the opposite corners IE: one silver in the top right corner & one silver in the bottom left corner. The silvers were tuned to different frequencies than the gold.
My MkIII had two black and two silver springs, all with black plastic top caps with three silver metal hemispheres on top (these made sliding the chassis easier for centering in the base). The different colored pairs of springs were supposed to be placed catercorner from each other, but I've forgotten which color was supposed to be where - I long since replaced the springs with NavCom Silencers, and think that on the whole they provide a more stable soundstage and more accurate sound. Hope this helps.
I had wondered about the two different color springs used. Now I know that is normal! One spring had collapsed over time by about 1/8 inch. Not normal. Last weekend I replaced my Mk IV springs with an Isolation Upgrade Kit from elusive Disc.
Isolation Upgrade Kit
My rig is on a cone supported rack with cone supported shelves and sits on concrete (cones through the carpet). So footfalls are a non-issue. A Dynavector XX2 Mk2 sits on an original JMW 10 arm with dropped weight. Enough with the details, what did it do for the sound? It absolutely transformed it. Dynamics, both micro and macro, jump off the disc. Focus is vastly improved. I'm sure other things good are happening that I can't put into words. The music takes me away and the gear disappears. At the price it is a no brainer. As always, YMMV.