Simple PCB foot for 3.5mm holes
thingiverse
A simple PCB foot sized to fit thru a 3.5mm hole. The foot itself is about 6mm diameter. If the foot is a little loose (or the PCB mounting hole is a little bigger) just use a soldering iron to heat a steel rule and melt the top of the foot as it comes thru the top of the PCB - sorta like a heat-stake.
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