I'm wondering if there is any way to determine if the mass ring was installed without removing the dust cap. I have a set of 136A that were reconed with 2235 cones. Whoever did it used wildly inappropriate surrounds so it makes me question whether or not they installed the mass rings. FWIW, I've removed the (stiff rubber) surrounds with less than expected damage to the cones and I'm going to install proper surrounds to just to see what my speakers are sorta supposed to sound like.