From a post by PSS AUDIO in this thread:
http://www.audioheritage.org/vbullet...=2742#post2721
”What do you mean by removing the mass rings from the 2235?
Can you give me/us information about it?”
A 2235H has a 35 gram mass controlling ring centered at the apex of the cone at the top of the voice coil former as shown in the attached photo: