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Thread: Proper glue for mass ring

  1. #1
    Junior Member
    Join Date
    Dec 2007
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    usa
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    6

    Proper glue for mass ring

    Could someone please suggest the best glue for repairing a 136 in an L300? The mass ring has become loose and I tried to reglue with Gorilla glue (the white expanding type) which I believe is a polyurathane type. Upon turning up a Yamaha M2 ....alas ....it came aloose again. Any help would be greatly appreciated

  2. #2
    Junior Member
    Join Date
    Nov 2014
    Location
    Minnesota
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    11
    I see there were no replies to this question. I have been searching everywhere myself. The only suggestion I could find was Loctite 380 or 410 but but it was by one person and he wasn't 100% sure. Please let me know what is recommended or what has worked for you.

    Thank you

  3. #3
    Senior Member
    Join Date
    Feb 2018
    Location
    Annapolis, MD
    Posts
    194
    JBL taught us to use the same glue as for the rest of the cone. So, back in the day it would have been a brown Bostik type glue (akin to rubber cement, 3M made or makes something similar). That said, mass-rings by their nature are hard to hold in place and if the driver is driven hard, it is VERY easy for the ring to smack the pole-piece and punch through the dust dome.

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