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Metal square G-size flange, self tapping screw holes (A-screw), horizontal PCB mount, retention spring instead of latch, https://www.neutrik.com/en/product/nc3fahl-0 A Series, 3 pole female XLR receptacle, grounding: mating connector shell and front panel, vertical PCB mount, https://www.neutrik.com/en/product/nc5mav-sw A Series, 4 pole female XLR receptacle, grounding: separate ground contact to mating connector shell and front panel: 9.8mm (alpha pots sliders: 3mm above panel, tight but possible micro toggle: probably too tight; could work with printed spacers mini toggle: ample space above 11.75mm (existing 1p12t rotaries, use 11.25mm holes to PCB edge 15.979999999999999mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 37-pin D-Sub connector horizontal angled 90deg THT female pitch 2.77x2.84mm mounting holes 47.1mm, distance of mounting holes 63.5mm, distance of mounting holes 25mm, distance of mounting holes - these gaps reduce heat conduction during soldering - ground plane created pull request 'Fix rail clearance = ~11.675mm, top.

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