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.
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.