Quad Lock 1" RAM Mount with Lock
thingiverse
I recommend purchasing the original Quad Lock phone case with a built-in lock and consider this 1" RAM adapter as an upgrade. You can find the original case at quadlockcase.eu. To install the adapter, you'll need one of these M5-6-7 screws that fit perfectly into the screw threads. Get yours on eBay from various sellers who offer them in bulk quantities.
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