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Make power connection traces larger; MK uses a ground plane on only one side when convenient. You can even use a nut behind the front panel. - Current design uses six IDC 2×8 connectors with 4 positions D Switch, single pole double throw, right angle, https://omronfs.omron.com/en_US/ecb/products/pdf/en-b3f.pdf tactile switch SPST right angle, http://spec_sheets.e-switch.com/specs/P040042.pdf E-Switch sub miniature slide switch, JS series, DPDT, right angle, http://spec_sheets.e-switch.com/specs/P040042.pdf E-Switch sub miniature slide switch, right-angle, http://www.ckswitches.com/media/1422/js.pdf switch spdt 0 3 3 Button_Switch_SMD SW_SPDT_PCM12 Ultraminiature Surface Mount Tactile Switch Ultra-small-sized Tactile Switch with High Contact Reliability, Side-actuated Model, with Ground Terminal, with Boss Ultra-small-sized Tactile Switch Ultra-small-sized Tactile Switch for High-Density Packaging with Ground Terminal, with Boss Ultra-small-sized Tactile Switch with High Contact Reliability, Top-actuated Model, without Ground Terminal, without Boss Ultra-small-sized Tactile Switch with LCD screen E3 SAxxxx switch normally-open pushbutton push-button D MEC 5E single pole double throw, illuminated paddle, http://www.nkkswitches.com/pdf/gwillum.pdf switch single-pole double-throw spdt ON-ON illuminated LED SW PUSH SMALL Tactile C&K Generic Buzzer, D12mm height 9.5mm shunt pin pitch 7.62mm length 17.8mm width 8.1mm Bourns.

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