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  1. stevo

    100-400 mark ii - Tripod Mount

    Sounds like you've stripped the thread.B (: Steve.
  2. stevo

    100-400 mark ii - Tripod Mount

    I don't own the lens myself but may have a solution for you,go down to your local model shop or halfords and get some threadlock.dab a little on the screw,you will still be able to remove the plate ,it'll just be held a little firmer. Cheers. Steve.