This is from the VPI website, a comparison of the jmw9 arms:
INTERNAL DAMPING
1.7 POUND DENSITY FOAM
2.5 POUND DENSITY FOAM
Something else must be wrong, I would contact them.
INTERNAL DAMPING
1.7 POUND DENSITY FOAM
2.5 POUND DENSITY FOAM
Something else must be wrong, I would contact them.