I have no issues using the Wits End cubby hole mount with my Samsung S2 8" tablet. Been using it for navigation for the past few months. It's pretty stable.
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@jonheld Did you use any loctite to keep the ram ball in place? I've tried the longer arms and anything past 10º to the left combined with some vibration while driving starts to loosen it and it falls, and that's with a Pixel XL, much less a tablet. Also limited on how much I can tighten it as the insert will start to strip in the housing. Any pointers? @NLXTACY?