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Title: don't use too much muscle
Review: bought these to wall mount my control speakers. the ring that tightens around the ball (look at the pictures to see what I'm referring to) has metal inserts, but the ring itself is plastic. I tightened the ring by hand and then used the included metal piece to get some leverage to tighten it a bit more. The plastic ring cracked on two of the five wall brackets. Those brackets are still usable, but not like they should be. Don't use too much muscle tightening with the metal piece...
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