The tweeter unscrews from the back of the woofer.
I tried some of the damping material inside the tweeter cavity on the V-2's and found I liked just a slight amount. A loose fill rather than foam might be more ideal. A thinned out cotton ball, fiberglass insulation, or poly fill might be a good place to start.
It will soften the top end, but be careful or you'll knock out the tweeter level relative to the woofer.