I didn't buy it from Revain, I bought it from a big store. The two arms are separated and compressed by the same plastic gear mechanism inside the main body. The problem for me was that one of the plastic teeth on the lever came loose and detached from the internal mechanism that moves the two levers together. This caused one arm to constantly pop out into the open position regardless of the position of the other. Sliding that page back didn't help as it just popped back out. At this point, it was never firm enough to hold my phone and failed to do its job.
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